build_docker.yaml

# Copyright (C) 2023 ISIS Rutherford Appleton Laboratory UKRI
# SPDX - License - Identifier: GPL-3.0-or-later

# This workflow uses actions that are not certified by GitHub.
# This workflow  creates and publishes Docker images to GitHub Container Registry (GHCR) for Ubuntu 18 and Centos 7
# This Workflow is triggered when a main branch is pushed to or a pull request is merged to main if the pull request has the label 'rebuild_docker'.

name: Build & Publish Docker Ubuntu18 & CentOS7

on:
  push:
    branches:
    - 'main'
    paths: ['docker/**', 'Dockerfile', 'conda/**', 'Makefile', 'setup.py', 'environment.yml', 'environment-dev.yml']
  pull_request:
    branches:
      - 'main'
    types: [ labeled ]
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    if: ${{ contains(github.event.pull_request.labels.*.name, 'rebuild_docker 🐋') || github.ref == 'refs/heads/main' }}
    runs-on: ubuntu-latest
    permissions:
      pull-requests: read
      contents: read
      packages: write
      deployments: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Log in to the Container registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Build and push Ubuntu Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          file: ./docker/ubuntu18.Dockerfile
          push: true
          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:ubuntu18
          labels: ${{ steps.meta.outputs.labels }}

      - name: Build and push Centos Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          file: ./docker/centos7.Dockerfile
          push: true
          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:centos7
          labels: ${{ steps.meta.outputs.labels }}