Merge Golang unit and integration test code coverage using GitHub Actions

ci.yml

name: CI
jobs:
  unit-tests:
    name: Unit Tests
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        
      - name: Set up Go
        uses: actions/setup-go@v5
        
        with:
          go-version-file: go.mod
          cache-dependency-path: go.sum
          
      - name: Run tests
        run: go test -covermode count ./... -test.gocoverdir="$PWD/test/coverage/unit"
        
      - name: Store test coverage
        uses: actions/upload-artifact@v4
        with:
          name: unit-test-coverage
          path: test/coverage/unit
          retention-days: 1

  integration-tests:
    name: Integration Tests
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        
      - name: Set up Go
        uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache-dependency-path: go.sum
          
      - name: Run tests
        run: go test -covermode count -tags=integration ./... -test.gocoverdir="$PWD/test/coverage/integration"
        
      - name: Store test coverage
        uses: actions/upload-artifact@v4
        with:
          name: integration-test-coverage
          path: test/coverage/integration
          retention-days: 1

  code-coverage:
    name: Code Coverage
    runs-on: ubuntu-latest
    needs: [unit-tests, integration-tests]
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        
      - name: Set up Go
        uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache-dependency-path: go.sum
          
      - name: Download unit test coverage
        uses: actions/download-artifact@v4
        with:
          name: unit-test-coverage
          path: test/coverage/unit
          run-id: ${{github.run_id}}
          
      - name: Download integration test coverage
        uses: actions/download-artifact@v4
        with:
          name: integration-test-coverage
          path: test/coverage/integration
          run-id: ${{github.run_id}}
          
      - name: Make combined test coverage directory
        run: mkdir test/coverage/combined
        
      - name: Merge unit and integration test coverage directories
        run: go tool covdata merge -i=test/coverage/unit,test/coverage/integration -o=test/coverage/combined
        
      - name: Convert coverage directory into legacy text format
        run: go tool covdata textfmt -i=test/coverage/combined -o=test/coverage/coverage.out
        
      - name: Generate code coverage report and badge
        if: ${{ github.ref == 'refs/heads/main' }}
        uses: ncruces/go-coverage-report@v0
        with:
          coverage-file: test/coverage/coverage.out
          report: true
          amend: true
        continue-on-error: true