Add a release workflow for PyPI in CI (Github Actions) (#1095)

* Fixes for new CI pipeline (Github Actions)

- Support ci skip tag on commits to avoid build dupes
- Add smarter path detection so we don't spam tons of tests
- Allow steps to cancel if previous steps were cancelled (don't always
  run)
- Separate workflows to be more modular
- Update release workflow to do a few more things
- Add helpful messages
- Be more strict in version checking (now with added regex)
- Make changelog smarter about when to trigger
- Add some functionality for changelog to handle releases and
  prereleases separately
- Better error handling
- Split up the version validation and the release to make way for more
  releases

* add step in workflow to merge to release branch after a release

* add check for git diff so commit doesn't error out constantly

.github/workflows/docs.yaml

@@ -0,0 +1,82 @@
+name: Docs
+
+on:
+  push:
+    branches: [ develop, release ]
+    paths:
+    - 'docs/**'
+    - 'mkdocs.yml'
+    - 'readthedocs.yml'
+  pull_request_target:
+    branches: [ develop ]
+    paths:
+    - 'docs/**'
+    - 'mkdocs.yml'
+    - 'readthedocs.yml'
+
+jobs:
+  accessibility:
+    if: contains(toJson(github.event.commits), '[ci skip]') == false
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.9
+
+    - name: Setup Node.js environment
+      uses: actions/setup-node@main
+
+    - name: poetry cache
+      uses: actions/cache@v2
+      with:
+        path: .venv
+        key: ${{ runner.os }}-${{ hashFiles('poetry.lock') }}-${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        pip install poetry
+        poetry config --local virtualenvs.in-project true
+        poetry install --no-root --remove-untracked
+        npm install pa11y pa11y-reporter-junit
+
+    - name: Start docs server
+      run: poetry run mkdocs serve &
+
+    - name: Accessibility testing (Pa11y)
+      run: poetry run .github/workflows/pa11y.sh
+
+    - name: Upload Unit Test Results
+      if: always()
+      uses: actions/upload-artifact@v2
+      with:
+        name: Unit Test Results (pa11y)
+        path: reports/pa11y/*.xml
+
+  publish-test-results:
+    if: success() || failure()
+    name: "Publish Unit Tests Results"
+    needs: accessibility
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Download Artifacts
+        uses: actions/download-artifact@v2
+        with:
+          path: artifacts
+
+      - name: Publish Unit Test Results
+        uses: EnricoMi/publish-unit-test-result-action@v1.4
+        if: always()
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          check_name: Unit Test Results
+          hide_comments: all but latest
+          comment_on_pr: true
+          files: '**/*.xml'
+          report_individual_runs: true
+          deduplicate_classes_by_file_name: false
+