update-base.yaml

name: Update docker base image

## Update the base image every day
on:
  workflow_dispatch:
  schedule:
  ## In UTC
  - cron: '0 0 * * *'

## Build base images to be used by other github workflows
jobs:

  build:
    name: Update base Erlang/OTP build images
    if: github.repository == 'erlang/otp'
    runs-on: ubuntu-latest

    strategy:
      matrix:
        type: [debian-base,ubuntu-base,i386-debian-base]

    steps:
      - uses: actions/checkout@v2
      - name: Docker login
        uses: docker/login-action@v1
        with:
          registry: docker.pkg.github.com
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Calculate BASE image
        id: base
        run: |
          echo "::set-output name=BASE_TAG::docker.pkg.github.com/erlang/otp/${{ matrix.type }}"
          .github/scripts/base-tag "${{ matrix.type }}"
      - name: Build base image
        run: |
          docker build --pull --tag ${{ steps.base.outputs.BASE_TAG }} \
            --cache-from ${{ steps.base.outputs.BASE_TAG }} \
            --file .github/dockerfiles/Dockerfile.${{ steps.base.outputs.BASE_TYPE }} \
            --build-arg USER=otptest --build-arg uid=$(id -u) \
            --build-arg GROUP=uucp --build-arg gid=$(id -g uucp) \
            --build-arg BASE=${{ steps.base.outputs.BASE }} .github
      - name: Push base image
        run: docker push ${{ steps.base.outputs.BASE_TAG }}