fix: CI setup for tsgolint Go build

- Linux build: checkout with submodules so tsgolint is available
- Add Go 1.26 via mise (separate step, doesn't pollute shared anchor)
- Install protoc v28.3 from GitHub releases
- Install protoc-gen-go and protoc-gen-go-grpc in CI and POM
- POM go install steps ensure local builds also work

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vdiez

.github/workflows/build.yml

@@ -142,7 +142,10 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.fork == false
     permissions: *read_permissions
     steps:
-      - *checkout
+      - name: Checkout source code with submodules
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          submodules: true
       - &mise
         uses: jdx/mise-action@v3.6.1
         with:
@@ -153,6 +156,22 @@ jobs:
             java = "21.0"
             maven = "3.9"
             node = "24.11.0"
+      - name: Setup Go and proto tools for tsgolint
+        uses: jdx/mise-action@v3.6.1
+        with:
+          version: 2025.11.2
+          mise_toml: |
+            [tools]
+            go = "1.26"
+      - name: Install protoc and Go proto generators
+        env:
+          PROTOC_VERSION: "28.3"
+        run: |
+          curl -sSLo /tmp/protoc.zip "https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-x86_64.zip"
+          sudo unzip -o /tmp/protoc.zip -d /usr/local bin/protoc
+          sudo chmod +x /usr/local/bin/protoc
+          go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+          go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
       - &npm_cache
         name: Cache NPM dependencies
         uses: SonarSource/gh-action_cache@v1

sonar-plugin/sonar-javascript-plugin/pom.xml

@@ -200,7 +200,7 @@
             </configuration>
           </execution>
 
-          <!-- tsgolint: init submodule -->
+          <!-- tsgolint: ensure submodule is initialized (no-op if already done by checkout) -->
           <execution>
             <id>tsgolint-submodule-init</id>
             <phase>initialize</phase>
@@ -232,6 +232,37 @@
               </arguments>
             </configuration>
           </execution>
+          <!-- tsgolint: install Go proto generators (idempotent) -->
+          <execution>
+            <id>tsgolint-install-proto-gen</id>
+            <phase>generate-resources</phase>
+            <goals><goal>exec</goal></goals>
+            <configuration>
+              <executable>go</executable>
+              <environmentVariables>
+                <GOWORK>off</GOWORK>
+              </environmentVariables>
+              <arguments>
+                <argument>install</argument>
+                <argument>google.golang.org/protobuf/cmd/protoc-gen-go@latest</argument>
+              </arguments>
+            </configuration>
+          </execution>
+          <execution>
+            <id>tsgolint-install-proto-gen-grpc</id>
+            <phase>generate-resources</phase>
+            <goals><goal>exec</goal></goals>
+            <configuration>
+              <executable>go</executable>
+              <environmentVariables>
+                <GOWORK>off</GOWORK>
+              </environmentVariables>
+              <arguments>
+                <argument>install</argument>
+                <argument>google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest</argument>
+              </arguments>
+            </configuration>
+          </execution>
           <!-- tsgolint: generate Go proto stubs -->
           <execution>
             <id>tsgolint-proto-gen-go</id>