add testpypi to ci

.github/workflows/ci.yml

@@ -16,23 +16,21 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: [3.6, 3.7, 3.8]
 
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: ${{ matrix.python-version }}
+        python-version: 3.8
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install flake8 pytest pytest-cov
         pip install numpy
         pip install h5py
         pip install dask
+        pip install build
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
@@ -43,3 +41,15 @@ jobs:
     - name: Test with pytest
       run: |
         python3 -m pytest --cov=swmr_tools
+    - name: Build a binary wheel and a source tarball
+      run: >-
+        python -m
+        build
+        --sdist
+        --wheel
+        --outdir dist/
+    - name: publish to TestPyPI
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+        repository_url: https://test.pypi.org/legacy/

pyproject.toml

@@ -0,0 +1,6 @@
+[build-system]
+requires = [
+    "setuptools>=42",
+    "wheel"
+]
+build-backend = "setuptools.build_meta"