Test YAML examples and upload artifacts in CI (#25)

- Added tests for application execution in CI.
- Configured CI to upload generated graphs as artifacts.

.github/workflows/bench-example.yml

@@ -0,0 +1,43 @@
+name: Spinner test
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11"]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install ".[dev]"
+    - name: Basic benchmark test
+      run: |
+         spinner -c docs/examples/sleep_benchmark.yaml -r T -e F
+    - name: Timeout test
+      run: |
+         spinner -c docs/examples/timeout_test.yaml -r T -e F
+    - name: Capture output test
+      run: |
+         spinner -c docs/examples/capture_output.yaml -r T -e T
+    - name: upload produced graphs
+      uses: actions/upload-artifact@v4
+      with:
+        name: generated graphs
+        path: |
+          report.html
+          output/