Enhance CI workflow with change checks and result validation

.github/workflows/python-test.yml

@@ -1,26 +1,37 @@
 name: Test Python Package
-
 on:
   pull_request:
     branches:
       - main
       - dev/\d+\.\d+\.\d+
     types: [opened, reopened, synchronize]
-    paths:
-      - 'src/pydom/**/*.py'
 
 permissions:
   contents: read
+  pull-requests: read
 
 jobs:
-  test:
+  check-changes:
     runs-on: ubuntu-latest
+    outputs:
+      python: ${{ steps.filter.outputs.python }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dorny/paths-filter@v4
+        id: filter
+        with:
+          filters: |
+            python:
+              - 'src/pydom/**/*.py'
 
+  test:
+    needs: check-changes
+    if: needs.check-changes.outputs.python == 'true'
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
-
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
@@ -32,14 +43,26 @@ jobs:
           python -m pip install --upgrade pip
           pip install -r requirements.txt
           pip install -r tests/requirements.txt
-
       - name: Run tests
         working-directory: ${{ github.workspace }}
         run: |
           python -m unittest discover -s tests -p 'test_*.py' -t ${{ github.workspace }}
-
       - name: Run build test
         working-directory: ${{ github.workspace }}
         run: |
           python -m pip install build
           python -m build
+
+  tests-passed:
+    runs-on: ubuntu-latest
+    needs: [check-changes, test]
+    if: always()
+    steps:
+      - name: Check result
+        run: |
+          if [[ "${{ needs.test.result }}" == "success" || "${{ needs.test.result }}" == "skipped" ]]; then
+            echo "All good - tests passed or were not required."
+          else
+            echo "Tests failed."
+            exit 1
+          fi