add a workflow ci

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: Pytest
+
+on: [push]
+#  push:
+#    branches:
+#      - main  # Modify this branch name as needed
+#  pull_request:
+#    branches:
+#      - main  # Modify this branch name as needed
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8  
+
+    - name: Install dependencies
+      run: |
+        pip install -r requirements.txt  
+
+    - name: Run pytest
+      run: |
+        cd hdr_schemata/tests/
+        pytest