Add workflow to test actions runner

Added a workflow file to test the proper functioning of
an actions runner for Gitea.

Added:
  - .gitea/workflows/test-runner.yaml

.gitea/workflows/test-runner.yaml

@@ -0,0 +1,18 @@
+    name: Test Gitea Runner
+    on: #[push] # Trigger the workflow on every push to the repository
+      workflow_dispatch:
+
+    jobs:
+      check-runner:
+        runs-on: ubuntu-latest # Specify the runner label (or a custom label if configured)
+        steps:
+          - name: Checkout repository
+            uses: actions/checkout@v4
+
+          - name: Run a simple echo command
+            run: echo "Hello from Gitea Actions Runner!"
+
+          - name: List files
+            run: |
+              echo "Listing files in the workspace..."
+              ls -laF