Add github workflows

.github/workflows/tests.yml

+name: resolve-tests
+on: [push]
+jobs:
+  test-standard:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-11.0, windows-2022]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - run: python -m pip install --user --upgrade setuptools pybind11 pytest numpy scipy
+      - run: python -m pip install --user .
+      - run: python -m pytest python/test -x
+  test-intel:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - run: python -m pip install --user --upgrade setuptools pybind11 pytest scipy
+      - run: sudo apt update
+      # fix this version for now, because the current one has trouble installing
+      - run: |
+          CC=icx CXX=icpx python3 -m pip install --user .
+          python -m pytest python/test -x

.github/workflows/wheels_cross_64bit.yml

+name: wheels_cross_64bit
+on: [push]
+jobs:
+  build-wheels:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macOS-10.15]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - run: python -m pip install --user --upgrade cibuildwheel
+      - run: python -m cibuildwheel --output-dir wheelhouse
+        env:
+          CIBW_ARCHS_MACOS: arm64
+          CIBW_SKIP: cp36-* pp*
+          CIBW_ENVIRONMENT: DUCC0_OPTIMIZATION=portable
+          CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_I686_IMAGE: manylinux2014
+          CIBW_MANYLINUX_PYPY_X86_64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_AARCH64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_PPC64LE_IMAGE: manylinux2014
+          CIBW_MANYLINUX_S390X_IMAGE: manylinux2014
+          CIBW_MANYLINUX_PYPY_AARCH64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_PYPY_I686_IMAGE: manylinux2014
+      - uses: actions/upload-artifact@v2
+        with:
+          path: ./wheelhouse/*.whl

.github/workflows/wheels_native_64bit.yml

+name: wheels_native_64bit
+on: [push]
+jobs:
+  build-wheels:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, macOS-10.15, windows-2019]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - run: python -m pip install --user --upgrade cibuildwheel
+      - run: python -m cibuildwheel --output-dir wheelhouse
+        env:
+          CIBW_ARCHS: auto64
+          CIBW_SKIP: cp36-* pp*
+          CIBW_ENVIRONMENT: DUCC0_OPTIMIZATION=portable
+          CIBW_TEST_REQUIRES: pytest
+          CIBW_TEST_COMMAND: pytest -x {project}/test
+          CIBW_TEST_SKIP: cp37-* cp38-* cp310-*
+          CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_I686_IMAGE: manylinux2014
+          CIBW_MANYLINUX_PYPY_X86_64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_AARCH64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_PPC64LE_IMAGE: manylinux2014
+          CIBW_MANYLINUX_S390X_IMAGE: manylinux2014
+          CIBW_MANYLINUX_PYPY_AARCH64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_PYPY_I686_IMAGE: manylinux2014
+      - uses: actions/upload-artifact@v2
+        with:
+          path: ./wheelhouse/*.whl