use github action from spelling module

.github/workflows/spellcheck.yml

@@ -1,26 +1,32 @@
 name: spellcheck
 
-on: [push]
+on:
+    - push
+    - pull_request
 
 jobs:
     build:
-
         runs-on: ubuntu-latest
 
+        strategy:
+            fail-fast: false
+            matrix:
+                tox-environment:
+                    - docs
+                    - linter
+                    - pkglint
+                    - spelling
+
         steps:
             - uses: actions/checkout@v2
-            - name: Set up Python
-              uses: actions/setup-python@v1
               with:
-                  python-version: 3.7
+                  fetch-depth: 0
+
+            - name: Set up Python
+              uses: actions/setup-python@v2
+
             - name: Install dependencies
-              run: |
-                  sudo apt update && sudo apt install -y enchant
-                  python -m pip install --upgrade setuptools
-                  python -m pip install --upgrade pyenchant sphinx-rtd-theme sphinxcontrib-spelling
-            - name: Check spelling
-                # show list of misspelled words
-              run: |
-                  make spelling
-                  if [[ -s "_build/spelling/output.txt" ]]; then cat "_build/spelling/output.txt"; fi
-                  if [[ -s "_build/spelling/output.txt" ]]; then false; fi
+              run: python -m pip install tox
+
+            - name: Run
+              run: tox -e ${{ matrix.tox-environment }}