ci: fail PR if Go code is not formatted with gofumpt

Author: moghit-eou

.github/workflows/gofumpt.yaml

@@ -0,0 +1,22 @@
+---
+name: Go Format
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  gofumpt:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.24"
+
+      - name: Install gofumpt
+        run: go install mvdan.cc/gofumpt@latest
+
+      - name: Check formatting
+        run: gofumpt -l -d .