Create Github Actions workflow to build and deploy on Test PyPi and PyPi

.github/workflows/action-pypi-build-and-deploy.yml

@@ -0,0 +1,41 @@
+name: PyPi Build and Deploy 🐍📦
+
+on:
+  push:
+    branches:
+     - master
+
+jobs:
+  build-n-publish:
+    name: Build and publish ESMValCore on PyPi
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+    - name: Install pep517
+      run: >-
+        python -m
+        pip install
+        pep517
+        --user
+    - name: Build a binary wheel and a source tarball
+      run: >-
+        python -m
+        pep517.build
+        --source
+        --binary
+        --out-dir dist/
+        .
+    #- name: Publish distribution 📦 to Test PyPI
+    #  uses: pypa/gh-action-pypi-publish@master
+    #  with:
+    #    password: ${{ secrets.test_pypi_password }}
+    #    repository_url: https://test.pypi.org/legacy/
+    - name: Publish distribution 📦 to PyPI
+      if: startsWith(github.ref, 'refs/tags')
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        password: ${{ secrets.pypi_password }}

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools >= 40.6.0", "wheel"]
+build-backend = "setuptools.build_meta"

setup.py

@@ -15,7 +15,8 @@
 
 from setuptools import Command, setup
 
-from esmvalcore._version import __version__
+sys.path.insert(0, os.path.dirname(__file__))
+from esmvalcore._version import __version__  # noqa: E402
 
 PACKAGES = [
     'esmvalcore',