actions: split qa and add explicit skipping

.github/workflows/code-quality.yaml

+name: Code Quality
+
+on:
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '.cirrus.yml'
+  push:
+    branches: [master]
+    paths-ignore:
+      - 'docs/**'
+      - '.cirrus.yml'
+
+jobs:
+  pre-commit:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+    - uses: pre-commit/action@v2.0.0

.github/workflows/main.yml

@@ -11,26 +11,12 @@ on:
   pull_request:
     paths-ignore:
       - 'docs/**'
+      - '.cirrus.yml'
     branches:
       - '**'
 
 jobs:
-  Linting:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v1
-        with:
-          python-version: 3.8
-      - name: Linting
-        run: |
-          pip install pre-commit
-          pre-commit run --all-files
-
-  Tests:
-    needs: Linting
+  tests:
     name: ${{ matrix.os }} / ${{ matrix.python-version }}
     runs-on: ${{ matrix.os }}-latest
     strategy:

.github/workflows/skip.yml

+# workaround for https://github.com/actions/virtual-environments/issues/1281
+name: Skip All Jobs
+
+on:
+  push:
+    paths:
+      - '!**'
+      - 'docs/**'
+      - '.cirrus.yml'
+    branches:
+      - master
+      - develop
+  pull_request:
+    paths:
+      - '!**'
+      - 'docs/**'
+      - '.cirrus.yml'
+    branches:
+      - '**'
+
+jobs:
+  pre-commit:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+      - run: exit 0
+
+  tests:
+    name: ${{ matrix.os }} / ${{ matrix.python-version
+    # we do not need os specific runners here, using linux is quicker
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [Ubuntu, MacOS, Windows]
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
+    steps:
+      - run: exit 0