Implement GitHub Actions as testing suite provider

.codecov.yml

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+ignore:
+  - "*/tests/*”

.github/workflows/sharpy_tests.yaml

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+name: Python package
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Set up GCC
+        uses: egor-tensin/setup-gcc@v1
+        with:
+          version: 10
+          platform: x64
+      - name: Setup conda
+        uses: s-weigand/setup-conda@v1
+        with:
+          python-version: 3.6
+      - name: Pre-Install dependencies
+        run: |
+          gfortran --version
+          wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
+          bash miniconda.sh -b -p $HOME/miniconda
+          export PATH="$HOME/miniconda/bin:$PATH"
+          hash -r
+          conda config --set always_yes yes --set changeps1 no
+          conda update -q conda
+          conda init bash
+          hash -r
+          export QT_QPA_PLATFORM='offscreen'
+          sudo apt install libeigen3-dev
+          conda env create -f utils/environment_minimal.yml
+          conda init bash
+          source activate sharpy_minimal
+          git submodule init
+          git submodule update
+          git fetch -t
+          source bin/sharpy_vars.sh
+          mkdir build && cd build
+          cmake .. && make install -j 4 && cd ..
+          pip install coverage
+          coverage run -m unittest discover
+      - name: Upload Coverage to Codecov
+        uses: codecov/codecov-action@v2
+        with:
+          verbose: true