build.yml

name: Build docker images

on:
  push:
    branches:
      - master
    tags:
      - '*'

env:
  REGISTRY: ${{ secrets.REGISTRY }}
  USERNAME: ${{ secrets.USERNAME }}
  PASSWORD: ${{ secrets.PASSWORD }}
  COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
  COSIGN_PRIVATE_KEY: ${{ secrets.COSIGN_PRIVATE_KEY }}
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Install Cosign
        uses: sigstore/cosign-installer@main

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

      - name: Login to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ env.USERNAME }}
          password: ${{ env.PASSWORD }}

      - name: Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Build and push latest images
        id: docker_build
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

      - name: Sign Docker Image with Cosign
        run: |
          images=""
          for tag in ${TAGS}; do
            images+="${tag}@${DIGEST} "
          done
          cosign sign --yes --key env://COSIGN_PRIVATE_KEY ${images}
        env:
          TAGS: ${{ steps.meta.outputs.tags }}
          COSIGN_PRIVATE_KEY: ${{ env.COSIGN_PRIVATE_KEY }}
          COSIGN_PASSWORD: ${{ env.COSIGN_PASSWORD }}
          DIGEST: ${{ steps.docker_build.outputs.digest }}