feat(languages): go fmt pipeline

.github/workflows/languages-go-fmt.yml

@@ -0,0 +1,52 @@
+name: Go Format
+
+on:
+  workflow_call:
+    inputs:
+      go-version-file:
+        description: "Path to go.mod for version resolution"
+        type: string
+        default: "go.mod"
+      run-vet:
+        description: "Also run go vet"
+        type: boolean
+        default: true
+
+jobs:
+  fmt:
+    name: gofmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: ${{ inputs.go-version-file }}
+          cache: true
+
+      - name: Check formatting
+        run: |
+          unformatted=$(gofmt -l .)
+          if [ -n "$unformatted" ]; then
+            echo "::error::The following files are not gofmt-formatted:"
+            echo "$unformatted"
+            echo ""
+            echo "Run: gofmt -w ."
+            exit 1
+          fi
+
+  vet:
+    name: go vet
+    runs-on: ubuntu-latest
+    needs: fmt
+    if: ${{ inputs.run-vet }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: ${{ inputs.go-version-file }}
+          cache: true
+
+      - name: go vet
+        run: go vet ./...