ci: fix formatting and YAML lint scope

Lint tracked YAML files without scanning generated dependencies.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -61,11 +61,22 @@ jobs:
       - name: Lint YAML syntax
         shell: bash
         run: |
+          mapfile -t yaml_files < <(
+            git ls-files '*.yaml' '*.yml' \
+              ':!node_modules/**' \
+              ':!**/.venv/**'
+          )
+
+          if [ "${#yaml_files[@]}" -eq 0 ]; then
+            echo "No YAML files found."
+            exit 0
+          fi
+
           docker run --rm \
             -v "$PWD:/work" \
             -w /work \
             cytopia/yamllint:latest \
-            -c .yamllint .
+            -c .yamllint "${yaml_files[@]}"
 
   lint-dockerfiles:
     runs-on: [self-hosted, linux, arch, homelab]