ci: optimize Actions usage - weekly cron, timeout, concurrency, path filters

Author: sfloess

.github/workflows/quality-gate.yml

@@ -3,11 +3,25 @@ name: Maven Quality Gate
 on:
   push:
     branches: [ main, develop ]
+    paths-ignore:
+      - '**.md'
+      - 'docs/**'
+      - 'LICENSE'
+      - '.gitignore'
   pull_request:
     branches: [ main, develop ]
+    paths-ignore:
+      - '**.md'
+      - 'docs/**'
+      - 'LICENSE'
+      - '.gitignore'
   schedule:
-    # Run daily at 2 AM UTC to catch dependency vulnerabilities
-    - cron: '0 2 * * *'
+    # Run weekly on Monday at 2:25 AM UTC
+    - cron: '25 2 * * 1'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 permissions:
   contents: read
@@ -17,6 +31,7 @@ permissions:
 jobs:
   quality-check:
     runs-on: ubuntu-latest
+    timeout-minutes: 15
 
     steps:
       - name: Checkout code