Merge pull request #249 from alphagov/build_own_ubuntu_base

build our own ubuntu base image

.github/workflows/image_middleman.yml

@@ -17,5 +17,5 @@ jobs:
     uses: ./.github/workflows/build-image-base.yml
     with:
       image: middleman
-      platforms: linux/amd64,linux/arm64
+      platforms: linux/amd64
     secrets: inherit

.github/workflows/image_ubuntu.yml

@@ -0,0 +1,21 @@
+---
+name: "Image: ubuntu"
+permissions:
+  actions: write # so 'cancel-workflow-action' can function
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  workflows:
+    uses: ./.github/workflows/build-image-base.yml
+    with:
+      image: ubuntu
+      platforms: linux/amd64,linux/arm64
+    secrets: inherit

middleman/Dockerfile

@@ -1,11 +1,12 @@
 FROM ghcr.io/alphagov/paas/ruby:main
 
-RUN apt-get update \
-    && apt-get install -y \
+RUN apt update \
+    && apt install -y \
         build-essential \
         libffi-dev \
         git \
         libcurl4-openssl-dev \
-        nodejs \
-    && gem install \
+        nodejs
+
+RUN gem install \
         middleman

ubuntu/Dockerfile

@@ -0,0 +1,8 @@
+FROM ubuntu:bionic
+
+RUN apt update \
+    && apt install -y \
+        openssl \
+        curl \
+        ca-certificates \
+        wget

ubuntu/README.md

@@ -0,0 +1,14 @@
+Provides Ubuntu. See the Dockerfile to check which version.
+
+This is primarily here to mirror the version from dockerhub. The
+purpose is to get that container onto GitHub Container Registry, to
+workaround rate limits and make our production use a bit safer.
+
+Additionally, installs some base crypto / net dependencies
+
+## Build locally
+
+```
+$ cd ubuntu
+$ docker build -t ubuntu .
+```