add github workflow

.github/workflows/python-tox-testing-rmf-env.yml

@@ -0,0 +1,29 @@
+name: poli rmf (conda, py3.9)
+
+on:
+  push:
+  schedule:
+    - cron: '0 0 * * 0'
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 5
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.9'
+    - name: Add conda to system path
+      run: |
+        # $CONDA is an environment variable pointing to the root of the miniconda directory
+        echo $CONDA/bin >> $GITHUB_PATH
+    - name: Install dependencies
+      run: |
+        python -m pip install tox
+    - name: Test rmf-related black boxes with tox and pytest
+      run: |
+        tox -c tox.ini -e poli-rmf-py39