ci: add unit test build (#2283)

.github/workflows/tests.yaml

@@ -68,8 +68,8 @@ jobs:
         name: Authenticate to Google Cloud
         uses: google-github-actions/auth@71fee32a0bb7e97b4d33d548e7d957010649d8fa # v2.1.3
         with:
-          workload_identity_provider: ${{ secrets.PROVIDER_NAME }}
-          service_account: ${{ secrets.SERVICE_ACCOUNT }}
+          workload_identity_provider: ${{ vars.PROVIDER_NAME }}
+          service_account: ${{ vars.SERVICE_ACCOUNT }}
           access_token_lifetime: 600s
 
       - name: Set up Cloud SDK
@@ -152,3 +152,19 @@ jobs:
           curl https://github.com/googleapis/repo-automation-bots/releases/download/flakybot-1.1.0/flakybot-darwin-amd64 -o flakybot -s -L
           chmod +x ./flakybot
           ./flakybot --repo ${{github.repository}} --commit_hash ${{github.sha}} --build_url https://github.com/${{github.repository}}/actions/runs/${{github.run_id}}
+
+  unit:
+    name: unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup Go
+        uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
+        with:
+          go-version: 1.22
+      - name: Checkout code
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      - name: Run tests
+        # specifying bash shell ensures a failure in a piped process isn't lost by using `set -eo pipefail`
+        shell: bash
+        run: |
+          go test -v -race -short ./...