ci: Parallelize Go tests jobs (#558)

Tests start to take quite a bit of time an in case a specific test kind
fails we have to restart the whole CI job.

To avoid this use a matrix to parallelize the go test jobs and skip the
steps that are not required in each step.

This is not optimal since we still repeat the setup (although some parts
are cached and in general the common part takes less than a minute), but
it still allows to get way faster builds (~ -50%) with a very minimal
effort

.github/workflows/qa.yaml

@@ -121,6 +121,10 @@ jobs:
   go-tests:
     name: "Go: Tests"
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        test: ["coverage", "race", "asan"]
     steps:
       - name: Install dependencies
         run: |
@@ -160,13 +164,16 @@ jobs:
           chmod +x ttyd.x86_64
           sudo mv ttyd.x86_64 /usr/bin/ttyd
 
-      - uses: actions-rs/toolchain@v1
+      - name: Install rust
+        if: matrix.test != 'asan'
+        uses: actions-rs/toolchain@v1
         with:
           profile: minimal
           toolchain: nightly # We need nightly to enable instrumentation for coverage.
           override: true
           components: llvm-tools-preview
       - name: Install grcov
+        if: matrix.test == 'coverage'
         run: |
           set -eu
           cargo install grcov
@@ -179,6 +186,7 @@ jobs:
 
           echo ASAN_OPTIONS="log_path=${artifacts_dir}/asan.log:print_stats=true" >> $GITHUB_ENV
       - name: Run tests (with coverage collection)
+        if: matrix.test == 'coverage'
         env:
           G_DEBUG: "fatal-criticals"
         run: |
@@ -208,10 +216,12 @@ jobs:
           mv "${raw_cov_dir}"/*.gcov "${cod_cov_dir}"
 
       - name: Run tests (with race detector)
+        if: matrix.test == 'race'
         run: |
           go test -timeout ${GO_TESTS_TIMEOUT} -race ./...
 
       - name: Run PAM tests (with Address Sanitizer)
+        if: matrix.test == 'asan'
         env:
           # Do not optimize, keep debug symbols and frame pointer for better
           # stack trace information in case of ASAN errors.
@@ -235,6 +245,7 @@ jobs:
           exit ${exit_code}
 
       - name: Upload coverage to Codecov
+        if: matrix.test == 'coverage'
         uses: codecov/codecov-action@v4
         with:
           directory: ./coverage/codecov
@@ -244,5 +255,5 @@ jobs:
         if: failure()
         uses: actions/upload-artifact@v4
         with:
-          name: authd-${{ github.job }}-artifacts-${{ github.run_attempt }}
+          name: authd-${{ github.job }}-${{ matrix.test }}-artifacts-${{ github.run_attempt }}
           path: ${{ env.AUTHD_TEST_ARTIFACTS_PATH }}