Add github action integration

.github/workflows/robotoff.yml

@@ -0,0 +1,31 @@
+name: Robotoff unit tests and deployments
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  unit-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Compile translations
+      run: sudo apt-get install gettext && cd i18n && bash compile.sh && cd ..
+    - name: Install dependencies
+      run: python -m pip install --upgrade pip && pip install setuptools && pip install -r requirements.txt && pip install -r requirements-dev.txt
+    - name: Launch tests
+      run: python -m pytest tests
+    - name: Run flake8
+      run: flake8
+    - name: Run black
+      run: black . --check
+    - name: Run mypy
+      run: mypy .