add docstr-coverage workflow

.docstr.yaml

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+paths:
+  - tardis
+#badge: docs
+#exclude: .*/test # regex
+verbose: 2 # int (0-3)
+skip_magic: True
+skip_file_doc: True
+skip_init: True
+skip_class_def: False
+skip_private: True
+follow_links: True
+#ignore_names_file: .*/test # regex
+#fail_under: 90
+percentage_only: False
+#ignore_patterns: # Dict with key/value pairs of file-pattern/node-pattern
+#  .*: method_to_ignore_in_all_files
+#  FileWhereWeWantToIgnoreAllSpecialMethods: "__.+__"
+#  SomeFile:
+#    - method_to_ignore1
+#    - method_to_ignore2
+#    - method_to_ignore3
+#  a_very_important_view_file:
+#    - "^get$"
+#    - "^set$"
+#    - "^post$"
+#  detect_.*:
+#    - "get_val.*"

.github/workflows/docstr-coverage.yml

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+name: docstr-coverage
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.x
+
+      - name: Install docstr-coverage
+        run: pip install docstr-coverage
+
+      - name: Get base coverage
+        run: |
+          git checkout ${{ github.event.pull_request.base.sha }}
+          echo "BASE_COV=$(docstr-coverage -p)" >> $GITHUB_ENV
+
+      - name: Get head coverage
+        run: |
+          git checkout ${{ github.event.pull_request.head.sha }}
+          docstr-coverage --fail-under=$BASE_COV
+
+      - name: Blame
+        if: ${{ failure() }}
+        run: |
+          git diff --name-only $(git merge-base ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }}) | xargs docstr-coverage --accept-empty