Add pytest GitHub action

.github/workflows/pytest.yml

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+# copied from https://github.com/XENONnT/straxen/blob/master/.github/workflows/pytest.yml
+# Test fuse on each PR.
+# We run three types of tests:
+#  - Pytest -> these are the "normal" tests and should be run for all
+#    python versions
+#  - Coveralls -> this is to see if we are covering all our lines of
+#    code with our tests. The results get uploaded to
+#    coveralls.io/github/XENONnT/fuse
+
+name: Test package
+
+# Trigger this code when a new release is published
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ "ubuntu-latest" ]
+        python-version: [ 3.9, 3.10 ]
+        test: [ 'coveralls', 'pytest' ]
+
+    steps:
+      # Setup and installation
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4.2.0
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Checkout repo
+        uses: actions/checkout@v3
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install pytest coverage coveralls
+          pip install -r requirements.txt
+
+      - name: Install fuse
+        run: |
+          pip install .
+
+      - name: Test package
+        # This is running a normal test
+        run: |
+          coverage run --source=fuse -m pytest --durations 0
+          coverage report
+
+      - name: Coveralls
+        # Make the coverage report and upload
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        if: matrix.test == 'coveralls'
+        run: |
+          coverage run --source=fuse -m pytest -v
+          coveralls --service=github
+
+      - name: goodbye
+        run: echo "tests done, bye bye"