ci: add go-fix job

Taken from runc.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

.github/workflows/validate.yml

@@ -36,3 +36,16 @@ jobs:
         run: |
           golangci-lint run --config .golangci-extra.yml --new-from-rev=HEAD~1
 
+  go-fix:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "${{ env.GO_VERSION }}"
+      - name: run go fix
+        run: |
+          go fix ./...
+          git diff --exit-code