Run C# tests with non-Bazel protobuf-ci actions.

The Bazel action currently isn't setup to regenerate the proto gencode itself, meaning that it won't actually be running on changes in the pending PR.  Long-term, we should migrate this back to Bazel after enabling proto codegen properly.

PiperOrigin-RevId: 611238217

.github/workflows/test_csharp.yml

@@ -20,13 +20,31 @@ jobs:
         uses: protocolbuffers/protobuf-ci/checkout@v2
         with:
           ref: ${{ inputs.safe-checkout }}
+
+      # TODO Run this with Bazel once codegen is handled properly.
       - name: Run tests
+        uses: protocolbuffers/protobuf-ci/docker@v2
+        with:
+          image: us-docker.pkg.dev/protobuf-build/containers/test/linux/csharp:3.1.415-6.0.100-66964dc8b07b6d1fc73a5cc14e59e84c1c534cea
+          credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
+          entrypoint: /bin/bash
+          command: >-
+            -c "
+            cd csharp &&
+            dotnet restore src/Google.Protobuf.sln &&
+            dotnet build -c Release src/Google.Protobuf.sln &&
+            dotnet test -c Release -f net6.0 src/Google.Protobuf.Test/Google.Protobuf.Test.csproj"
+
+      - name: Clear bazel between docker instances
+        run: sudo rm -rf _build
+
+      - name: Run conformance tests
         uses: protocolbuffers/protobuf-ci/bazel-docker@v2
         with:
           image: us-docker.pkg.dev/protobuf-build/containers/test/linux/csharp:3.1.415-6.0.100-66964dc8b07b6d1fc73a5cc14e59e84c1c534cea
           credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
           bazel-cache: csharp_linux
-          bazel: test //csharp/... --action_env=DOTNET_CLI_TELEMETRY_OPTOUT=1 --test_env=DOTNET_CLI_HOME=/home/bazel
+          bazel: test //csharp:conformance_test --action_env=DOTNET_CLI_TELEMETRY_OPTOUT=1 --test_env=DOTNET_CLI_HOME=/home/bazel
 
   windows:
     name: Windows
@@ -42,11 +60,22 @@ jobs:
         with:
           dotnet-version: '6.0.x'
 
-      - name: Build
-        run: dotnet build csharp/src/Google.Protobuf.sln
+      # Workaround for incompatibility between gcloud and windows-2019 runners.
+      - name: Install Python
+        uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1 # v4.7.0
+        with:
+          python-version: '3.9'
+      - name: Use custom python for gcloud
+        run: echo "CLOUDSDK_PYTHON=${Python3_ROOT_DIR}\\python3" >> $GITHUB_ENV
+        shell: bash
 
-      - name: Run Tests
-        run: dotnet test csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
+      - name: Run tests
+        uses: protocolbuffers/protobuf-ci/bash@v2
+        with:
+          credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
+          command: |
+            dotnet build csharp/src/Google.Protobuf.sln
+            dotnet test csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
 
   linux-aarch64:
     name: Linux aarch64