Adding devcontainer definition

.github/workflows/devcontainer-feature-release.yml

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+name: Build dev container feature image
+
+env:
+  IMAGE_NAME: ${{ github.repository }}
+  REGISTRY: ghcr.io
+
+on:
+  push:
+    paths:
+      - "ext/devcontainer/**"
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    if: ${{ github.ref == 'refs/heads/main' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: "Publish Features"
+        uses: devcontainers/action@v1
+        with:
+          publish-features: "true"
+          base-path-to-features: "./ext/devcontainer"
+          generate-docs: "true"

.github/workflows/devcontainer-feature-test.yml

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+name: Test dev container feature image
+on:
+  push:
+    paths:
+      - "ext/devcontainer/**"
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    strategy:
+      matrix:
+        baseImage:
+          [
+            "ubuntu:focal",
+            "ubuntu:jammy",
+            "ubuntu:bionic",
+            "debian:11",
+            "debian:10",
+            "mcr.microsoft.com/devcontainers/base:ubuntu",
+            "mcr.microsoft.com/devcontainers/base:debian",
+          ]
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: "Install latest devcontainer CLI"
+        run: npm install -g @devcontainers/cli
+
+      - name: "Generating tests for 'azd' against '${{ matrix.baseImage }}'"
+        run: devcontainer features test -f azd -i ${{ matrix.baseImage }} .
+        working-directory: ./ext/devcontainer
+
+  test-scenarios:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: "Install latest devcontainer CLI"
+        run: npm install -g @devcontainers/cli
+
+      - name: "Testing 'azd' scenarios"
+        run: devcontainer features test -f azd --skip-autogenerated .
+        working-directory: ./ext/devcontainer
+
+  test-global:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: "Install latest devcontainer CLI"
+        run: npm install -g @devcontainers/cli
+
+      - name: "Testing global scenarios"
+        run: devcontainer features test --global-scenarios-only .
+        working-directory: ./ext/devcontainer

ext/devcontainer/src/azd/README.md

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+# Azure Developer CLI (azure-dev-cli)
+
+Installs the [Azure Developer CLI](https://github.com/Azure/azure-dev) along with needed dependencies.
+
+## Example Usage
+
+```json
+"features": {
+        "ghcr.io/azure/azure-dev/azd:1": {
+            "version": "latest"
+        }
+}
+```
+
+## Options
+
+| Options Id | Description | Type | Default Value |
+|-----|-----|-----|-----|
+| version | Select or enter an Azure Developer CLI version. (Available versions may vary by Linux distribution.) | string | latest |

ext/devcontainer/src/azd/devcontainer-feature.json

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+{
+    "id": "azd",
+    "version": "1.0.0",
+    "name": "Azure Dev CLI",
+    "documentationURL": "https://github.com/azure/azure-dev/tree/main/ext/devcontainer/src/azd",
+    "description": "Installs the Azure Developer CLI along with needed dependencies.",
+    "options": {
+      "version": {
+        "type": "string",
+        "proposals": [
+          "latest"
+        ],
+        "default": "latest",
+        "description": "Select or enter an Azure Developer CLI version. (Available versions may vary by Linux distribution.)"
+      }
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+              "ms-azuretools.vscode-bicep",
+              "ms-vscode.vscode-node-azure-pack"
+            ]
+        }
+    }
+  }

ext/devcontainer/src/azd/install.sh

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+AZ_VERSION=${VERSION:-"latest"}
+
+check_packages() {
+    if ! dpkg -s "$@" > /dev/null 2>&1; then
+        if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+            echo "Running apt-get update..."
+            apt-get update -y
+        fi
+        apt-get -y install --no-install-recommends "$@"
+    fi
+}
+
+echo "(*) Ensuring dependencies are installed"
+
+check_packages apt-transport-https curl ca-certificates gnupg2 dirmngr
+
+echo "(*) Installing Azure Dev CLI"
+
+curl -fsSLO https://aka.ms/install-azd.sh
+chmod +x ./install-azd.sh
+
+./install-azd.sh --version $AZ_VERSION

ext/devcontainer/test/azd/test.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "version" azd version
+
+# Report result
+reportResults