name: Docker Build & Scan

on:
  push:
    branches: [main]
    tags: ["v*"]
  pull_request:
    branches: [main]

permissions:
  contents: read
  packages: write
  security-events: write

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

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Lowercase image name
        id: img
        run: echo "name=${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GHCR
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v4
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ${{ env.REGISTRY }}/${{ steps.img.outputs.name }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha,prefix=sha-

      - name: Build image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          load: ${{ github.event_name == 'pull_request' }}

      - name: Trivy scan
        if: github.event_name != 'pull_request'
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: ${{ env.REGISTRY }}/${{ steps.img.outputs.name }}:sha-${{ github.sha }}
          format: sarif
          output: trivy-results.sarif
          severity: CRITICAL,HIGH
          exit-code: "0"
        continue-on-error: true

      - name: Upload Trivy results
        if: github.event_name != 'pull_request' && hashFiles('trivy-results.sarif') != ''
        uses: github/codeql-action/upload-sarif@v3
        with:
          sarif_file: trivy-results.sarif
          category: trivy

      - name: Generate SBOM
        if: github.event_name != 'pull_request'
        uses: anchore/sbom-action@v0
        with:
          image: ${{ env.REGISTRY }}/${{ steps.img.outputs.name }}:sha-${{ github.sha }}
          format: spdx-json
          output-file: sbom.spdx.json
        continue-on-error: true

      - name: Upload SBOM artifact
        if: always()
        uses: actions/upload-artifact@v7
        with:
          name: sbom
          path: sbom.spdx.json