Merge pull request #124 from alphagov/add-action-to-build-image-and-c…

…reate-pr

Add GitHub Action to build Docker images and create PR against govuk-dgu-charts repo

.github/workflows/build-image.yaml

@@ -0,0 +1,45 @@
+name: Build and push images
+
+on:
+  workflow_dispatch:
+    inputs:
+      buildType:
+        description: Decide on build type
+        required: true
+        type: choice
+        options:
+          - build_push
+          - build_only
+  push:
+    branches:
+      - main
+
+jobs:
+  build_and_push:
+    name: datagovuk-tech-docs
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Login to GHCR
+        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a  # v2.1.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.gitRef }}
+      - name: Build images (without pushing to registry)
+        if: ${{ inputs.buildType == 'build_only' }}
+        env:
+          DRY_RUN: "1"
+          APP: datagovuk-tech-docs
+          ARCH: amd64
+        run: ./docker/build-image.sh
+      - name: Build and push images
+        if: ${{ inputs.buildType == 'build_push' || github.ref == 'refs/heads/main' }}
+        env:
+          APP: datagovuk-tech-docs
+          ARCH: amd64
+        run: ./docker/build-image.sh

.github/workflows/create-pr.yaml

@@ -0,0 +1,27 @@
+name: Create charts PR
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    workflows: [ "Build and push images" ]
+    types:
+      - completed
+    branches:
+      - main
+
+jobs:
+  create_pr:
+    name: Create charts PR
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout datagovuk-tech-docs repository
+        uses: actions/checkout@v4
+        with:
+          repository: alphagov/datagovuk-tech-docs
+      - name: Create PR
+        run: bash ./docker/create-pr.sh
+        env:
+          GH_TOKEN: ${{ secrets.PR_GITHUB_TOKEN }}
+          GH_REF: ${{ github.ref_name }}
+          IS_TAG: "false"
+          ENVS: "integration"

docker/build-image.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+set -eux
+
+build () {
+  if [ "${ARCH}" = "amd64" ]; then
+    docker build . -t "ghcr.io/alphagov/${APP}:${1}" -f "docker/Dockerfile"
+  else
+    docker buildx build --platform "linux/${ARCH}" . -t "ghcr.io/alphagov/${APP}:${1}" -f "docker/Dockerfile"
+  fi
+}
+
+DOCKER_TAG="${GITHUB_SHA}"
+
+if [[ -n ${GH_REF:-} ]]; then
+  DOCKER_TAG="${GH_REF}"
+fi
+
+build "${DOCKER_TAG}"
+
+if [[ -n ${DRY_RUN:-} ]]; then
+  echo "Dry run; not pushing to registry"
+else
+  docker push "ghcr.io/alphagov/${APP}:${DOCKER_TAG}"
+fi

docker/create-pr.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -eux
+
+if [[ ${IS_TAG:-} = "true" ]]; then
+  export IMAGE_TAG="${GH_REF}"
+  export SOURCE_BRANCH="main"
+else
+  export IMAGE_TAG=$(gh api repos/alphagov/datagovuk-tech-docs/branches/${GH_REF} | jq .commit.sha -r)
+  export SOURCE_BRANCH=${GH_REF}
+fi
+
+git config --global user.email "govuk-ci@users.noreply.github.com"
+git config --global user.name "govuk-ci"
+
+git clone https://${GH_TOKEN}@github.com/alphagov/govuk-dgu-charts.git charts
+
+cd charts/charts/datagovuk/images
+
+for ENV in $(echo $ENVS | tr "," " "); do
+  (
+    BRANCH="ci/${IMAGE_TAG}-${ENV}"
+
+    if git show-ref --quiet refs/heads/${BRANCH}; then
+      echo "Branch ${BRANCH} already exists on govuk-dgu-charts"
+    else
+      git checkout -b ${BRANCH}
+
+      cd "${ENV}"
+      yq -i '.tag = env(IMAGE_TAG)' "techdocs.yaml"
+      yq -i '.branch = env(SOURCE_BRANCH)' "techdocs.yaml"
+      git add "techdocs.yaml"
+
+      if [[ $(git status | grep "nothing to commit") ]]; then
+        echo "Nothing to commit"
+      else
+        git commit -m "Update datagovuk-tech-docs image tags for ${ENV} to ${IMAGE_TAG}"
+        git push --set-upstream origin "${BRANCH}"
+        gh pr create --title "Update datagovuk-tech-docs image tags for ${ENV} (${IMAGE_TAG})" --base main --head "${BRANCH}" --fill
+      fi
+    fi
+  )
+done