(PTFE-2737) Add packer setup for rocky

packer/gcp/rocky/README.md

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+# Rocky Linux Packer Template
+
+This directory contains the Packer template and scripts to build optimized Rocky Linux 8 base images for GitHub Actions self-hosted runners on GCP.
+
+## 📊 Performance
+
+- **Standard spawn time:** 4min37s (277s)
+- **With Packer image:** 2min21s (141s)
+- **Improvement:** 49% faster ⚡
+- **Time saved per instance:** 136 seconds (2min16s)
+
+## 📦 What's Pre-installed
+
+- Docker CE + containerd.io
+- EPEL repository (Extra Packages for Enterprise Linux)
+- System updates (yum update)
+- Base development tools (bind-utils, yum-utils)
+- Docker service enabled
+- Optimized for GitHub Actions runner deployment
+
+## 🚀 Quick Start
+
+### Build Locally
+
+```bash
+./build.sh
+```
+
+The script will interactively prompt you for:
+
+- GCP Project ID
+- GCP Zone
+- Disk size (default: 80 GB)
+- Image name (auto-generated with timestamp)
+
+### Manual Build
+
+```bash
+# Initialize Packer
+packer init template.pkr.hcl
+
+# Validate
+packer validate \
+  -var="project_id=YOUR_PROJECT" \
+  -var="zone=europe-west1-b" \
+  -var="disk_size=80" \
+  -var="image_name=github-runner-base-rocky-8-$(date +%Y%m%d-%H%M%S)" \
+  template.pkr.hcl
+
+# Build
+packer build \
+  -var="project_id=YOUR_PROJECT" \
+  -var="zone=europe-west1-b" \
+  -var="disk_size=80" \
+  -var="image_name=github-runner-base-rocky-8-$(date +%Y%m%d-%H%M%S)" \
+  template.pkr.hcl
+```
+
+## 📋 Files
+
+- **template.pkr.hcl** - Packer template definition
+- **build.sh** - Interactive build script
+- **provision.sh** - Shell provisioning script (if used)
+- **variables.pkrvars.hcl.example** - Example variables file
+- **config-example.yaml** - Runner-manager configuration example
+
+## 🛠️ Customization
+
+To customize the image, edit:
+
+1. **template.pkr.hcl** - Modify build configuration, machine type, disk size
+2. **provisioners** - Add/remove provisioning steps
+
+Example: Add additional packages
+
+```hcl
+provisioner "shell" {
+  inline = [
+    "sudo yum install -y your-package",
+  ]
+}
+```
+
+## 💡 Why EPEL?
+
+EPEL (Extra Packages for Enterprise Linux) provides most GitHub Actions runner dependencies:
+
+- `lttng-ust`
+- `openssl-libs`
+- `krb5-libs`
+- `zlib`
+- `libicu`
+
+By pre-installing EPEL in the Packer image, the runner's `installdependencies.sh` script finds these packages already available, significantly reducing startup time.
+
+## 📝 Notes
+
+- Build machine: e2-standard-2 (2 vCPU, 8 GB RAM)
+- Build time: ~10-15 minutes
+- Disk size: 80 GB SSD
+- Image family: `github-runner-base-rocky-8`
+- Source image: `rocky-linux-8` from `rocky-linux-cloud`
+
+## ⚠️ Important
+
+Rocky Linux 8 runners show the **best performance improvement** (49% vs 35% for Ubuntu) because:
+
+1. Standard Rocky VMs take much longer to provision (4min37s vs 2min09s)
+2. EPEL installation eliminates most dependency installation time
+3. Docker pre-installation is more impactful on Rocky
+
+## 🔗 See Also
+
+- [Main Packer README](../README.md)
+- [Runner Manager Documentation](../../README.md)
+- [Rocky Linux Documentation](https://docs.rockylinux.org/)
+- [Packer GCP Builder Documentation](https://developer.hashicorp.com/packer/integrations/hashicorp/googlecompute)

packer/gcp/rocky/build.sh

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+#!/bin/bash
+# Interactive script to build Rocky Linux 8 GitHub Runner base image with Packer
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo "=========================================="
+echo "   Rocky Linux 8 Runner Image Builder"
+echo "=========================================="
+echo
+
+# Check prerequisites
+echo "Checking prerequisites..."
+
+# Check if packer is installed
+if ! command -v packer &>/dev/null; then
+	echo "❌ Error: Packer is not installed"
+	echo "   Install from: https://www.packer.io/downloads"
+	exit 1
+fi
+echo "✅ Packer found: $(packer version)"
+
+# Check if gcloud is installed
+if ! command -v gcloud &>/dev/null; then
+	echo "❌ Error: gcloud CLI is not installed"
+	echo "   Install from: https://cloud.google.com/sdk/docs/install"
+	exit 1
+fi
+echo "✅ gcloud CLI found"
+
+# Check gcloud authentication
+if ! gcloud auth list --filter=status:ACTIVE --format="value(account)" &>/dev/null; then
+	echo "❌ Error: No active gcloud authentication"
+	echo "   Run: gcloud auth login"
+	exit 1
+fi
+ACTIVE_ACCOUNT=$(gcloud auth list --filter=status:ACTIVE --format="value(account)")
+# trunk-ignore-all(shellcheck)
+echo "✅ Authenticated as: ${ACTIVE_ACCOUNT}"
+
+echo
+echo "Prerequisites check passed!"
+echo
+
+# Get configuration
+read -p "Enter GCP Project ID [scality-prod-ga-runners]: " PROJECT_ID
+PROJECT_ID=${PROJECT_ID:-scality-prod-ga-runners}
+
+read -p "Enter GCP Zone [europe-west1-b]: " ZONE
+ZONE=${ZONE:-europe-west1-b}
+
+# Choose Rocky Linux version
+echo
+echo "Available Rocky Linux versions:"
+echo "  1) Rocky Linux 8 (recommended)"
+echo "  2) Rocky Linux 9"
+echo "  3) Custom version"
+read -p "Select Rocky Linux version (1/2/3): " VERSION_CHOICE
+
+case ${VERSION_CHOICE} in
+1)
+	ROCKY_VERSION="8"
+	echo "✅ Selected: Rocky Linux 8"
+	;;
+2)
+	ROCKY_VERSION="9"
+	echo "✅ Selected: Rocky Linux 9"
+	;;
+3)
+	read -p "Enter Rocky Linux version (e.g., 8 or 9): " ROCKY_VERSION
+	echo "✅ Selected: Rocky Linux ${ROCKY_VERSION}"
+	;;
+*)
+	ROCKY_VERSION="8"
+	echo "⚠️  Invalid choice, defaulting to Rocky Linux 8"
+	;;
+esac
+
+read -p "Enter disk size in GB [80]: " DISK_SIZE
+DISK_SIZE=${DISK_SIZE:-80}
+
+# Generate image name with timestamp
+TIMESTAMP=$(date +%Y%m%d-%H%M%S)
+IMAGE_NAME="github-runner-base-rocky-${ROCKY_VERSION}-${TIMESTAMP}"
+
+echo
+echo "=========================================="
+echo "Build Configuration:"
+echo "=========================================="
+echo "Project ID:    ${PROJECT_ID}"
+echo "Zone:          ${ZONE}"
+echo "Rocky Version: ${ROCKY_VERSION}"
+echo "Disk Size:     ${DISK_SIZE}GB"
+echo "Image Name:    ${IMAGE_NAME}"
+echo "Image Family:  github-runner-base-rocky-${ROCKY_VERSION}"
+echo "=========================================="
+echo
+
+read -p "Proceed with build? (yes/no): " CONFIRM
+if [[ ${CONFIRM} != "yes" ]]; then
+	echo "Build cancelled."
+	exit 0
+fi
+
+echo
+echo "Starting Packer build..."
+echo "This will take approximately 10-15 minutes."
+echo
+
+# Initialize Packer
+echo "Initializing Packer plugins..."
+packer init template.pkr.hcl
+
+# Validate template
+echo "Validating Packer template..."
+packer validate \
+	-var="project_id=${PROJECT_ID}" \
+	-var="zone=${ZONE}" \
+	-var="image_name=${IMAGE_NAME}" \
+	-var="rocky_version=${ROCKY_VERSION}" \
+	-var="disk_size=${DISK_SIZE}" \
+	template.pkr.hcl
+
+# Build image
+echo
+echo "Building image (this will take several minutes)..."
+packer build \
+	-var="project_id=${PROJECT_ID}" \
+	-var="zone=${ZONE}" \
+	-var="image_name=${IMAGE_NAME}" \
+	-var="rocky_version=${ROCKY_VERSION}" \
+	-var="disk_size=${DISK_SIZE}" \
+	template.pkr.hcl | tee "packer-build-rocky-${TIMESTAMP}.log"
+
+echo
+echo "=========================================="
+echo "✅ Build completed successfully!"
+echo "=========================================="
+echo
+echo "Image Details:"
+echo "  Name:   ${IMAGE_NAME}"
+echo "  Family: github-runner-base-rocky-${ROCKY_VERSION}"
+echo
+echo "To use this image in runner-manager, update your config.yaml:"
+echo "  runner_groups:"
+echo "    - name: rocky-${ROCKY_VERSION}-packer-gcloud"
+echo "      cloud_provider: gcloud"
+echo "      image_family: github-runner-base-rocky-${ROCKY_VERSION}"
+echo "      image_project: ${PROJECT_ID}"
+echo
+echo "Build log saved to: packer-build-rocky-${TIMESTAMP}.log"
+echo "Manifest saved to: manifest-rocky.json"
+echo

packer/gcp/rocky/provision.sh

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+#!/bin/bash
+# Rocky Linux provisioning script for GitHub Actions runner base image
+# This script is called by Packer to configure the image
+
+set -e
+
+echo "=========================================="
+echo "Rocky Linux Provisioning Starting"
+echo "=========================================="
+
+# Update system packages
+echo "Step 1/4: Updating system packages..."
+yum update -y
+
+# Install base dependencies
+echo "Step 2/4: Installing base dependencies..."
+yum install -y bind-utils yum-utils
+
+# Install Docker CE
+echo "Step 3/4: Installing Docker CE..."
+yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+yum install -y epel-release docker-ce docker-ce-cli containerd.io
+
+# Configure Docker
+systemctl enable docker
+groupadd -f docker
+
+# Clean up
+echo "Step 4/4: Cleaning up..."
+yum clean all
+rm -rf /var/cache/yum
+rm -rf /tmp/*
+rm -f ~/.bash_history
+
+echo "=========================================="
+echo "Rocky Linux Provisioning Completed"
+echo "=========================================="