ci: add deps job

Simpler than that in runc as we don't use vendor here.

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

Author: kolyshkin

.github/workflows/validate.yml

@@ -65,3 +65,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: if git -P grep -I -n '\s$'; then echo "^^^ extra whitespace at EOL, please fix"; exit 1; fi
+
+  deps:
+    runs-on: ubuntu-24.04
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-go@v5
+      with:
+        go-version: "${{ env.GO_VERSION }}"
+    - run: go mod tidy --diff