chore: add golang workflow

.github/workflows/golang.yaml

@@ -0,0 +1,61 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+name: Golang
+on: [push, pull_request, merge_group]
+permissions:
+  contents: read
+  issues: write
+jobs:
+  test:
+    runs-on: ubuntu-24.04
+    # Presubmit jobs must complete within 5 minutes. See CONTRIBUTING.md.
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
+        with:
+          go-version-file: "go.mod"
+      - uses: ./.github/actions/install-protoc
+      - name: Install Go dependencies
+        run: |
+          go install google.golang.org/protobuf/cmd/protoc-gen-go@v${GO_PROTOC_PLUGIN_VERSION}
+          go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v${GO_PROTOC_GRPC_PLUGIN_VERSION}
+          go install github.com/googleapis/gapic-generator-go/cmd/protoc-gen-go_gapic@v${GO_GAPIC_VERSION}
+          go install golang.org/x/tools/cmd/goimports@latest
+        env:
+          GO_PROTOC_PLUGIN_VERSION: 1.35.2
+          GO_PROTOC_GRPC_PLUGIN_VERSION: 1.3.0
+          GO_GAPIC_VERSION: 0.57.0
+      - name: Run tests
+        run: |
+          go test -race -coverprofile=coverage.out -covermode=atomic ./internal/librarian/golang
+      - name: Upload coverage report
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+  create-issue-on-failure:
+    runs-on: ubuntu-24.04
+    needs: [test]
+    if: ${{ always() && contains(needs.*.result, 'failure') && github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+    steps:
+      - name: Create an issue for push event to main
+        run: |
+          ISSUE_TITLE="all: tests failed at HEAD"
+          BODY="Tests failed at HEAD of the \`main\` branch. Please review Workflow Run: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }} for detail."
+          ISSUE_LINK=$(gh issue create --title "$ISSUE_TITLE" --body "$BODY" --label ":rotating_light: critical" --assignee ${{ github.actor }} -R $GH_REPO)
+          ISSUE_NUM=${ISSUE_LINK##*/}
+          gh issue comment $ISSUE_NUM --body "@googleapis/cloud-sdk-librarian-team A critical issue has been created, please respond immediately."
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}

.github/workflows/librarian.yaml

@@ -65,7 +65,7 @@ jobs:
       - name: Run tests
         run: |
           go test -race -coverprofile=coverage.out -covermode=atomic \
-            $(go list ./... | grep -v -E 'internal/librarian/(python|rust|dart)|internal/sidekick|internal/legacylibrarian')
+            $(go list ./... | grep -v -E 'internal/librarian/(dart|golang|python|rust)|internal/sidekick|internal/legacylibrarian')
       - name: Upload coverage report
         uses: codecov/codecov-action@v5
         with: