Add linting for YAML files

.github/workflows/ci.yml

@@ -56,3 +56,15 @@ jobs:
       - uses: actions/checkout@v4
       - uses: risc0/risc0/.github/actions/[email protected]
       - run: cargo fmt --all --check
+
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - name: 🚀 Run yamllint
+        uses: frenck/action-yamllint@v1
+        with:
+          path: ".github/"
+          config: ".yamllint"

.yamllint

@@ -0,0 +1,7 @@
+extends: default
+
+rules:
+  # 80 chars should be enough, but don't fail if a line is longer
+  line-length:
+    max: 80
+    level: warning