build_image.yaml

name: Build and Push Image

on:
  push:
    branches:
      - '**'

permissions:
  contents: read
  packages: write

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: cabinetoffice/fb-user-datastore-api

jobs:
  build-fb-user-datastore-api:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Compute tag
        id: tag
        shell: bash
        run: |
          set -euo pipefail
          sha="${GITHUB_SHA}"
          short_sha="${sha:0:7}"
          ref="${GITHUB_REF_NAME}"

          if [[ "$ref" == "main" ]]; then
            tag="main-${short_sha}"
          else
            # Sanitize branch name for Docker tag compatibility.
            safe_ref="$(echo "$ref" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9_.-]/-/g')"
            tag="branch-${safe_ref}-${short_sha}"
          fi

          echo "value=$tag" >> "$GITHUB_OUTPUT"

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.tag.outputs.value }}