Initial unit testing action

.github/workflows/unittests.yml

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+name: Unit Testing Action
+
+on: [push]
+jobs:
+  unittest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.8'
+
+      - name: Install dependencies
+        run: |
+          apt-get update
+          apt-get install gettext libxapian-dev libgraphviz-dev
+
+      - name: Install poetry
+        run: |
+          python -m install --upgrade pip
+          python -m pip install poetry
+
+      - name: Checking pyproject.toml syntax
+        run: poetry check
+
+      - name: Install project
+        run: poetry install -E testing
+
+      - name: Setup xapian index
+        run: |
+          mkdir -p /dev/shm/search_indexes
+          ln -s /dev/shm/search_indexes sith/search_indexes
+
+      - name: Setup project
+        run: poetry run ./manage.py compilemessages
+      
+      - name: Launch tests and generate coverage report
+        run: |
+          poetry run coverage run ./manage.py test
+          poetry run coverage report
+  
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.8'
+
+      - name: Install black
+        run: |
+          python -m install --upgrade pip
+          python -m pip install black==22.6.0
+
+      - name: Check linting
+        run: black check .