ci: Add Linux/tox tests to GitHub Actions

.github/workflows/ci.yml

@@ -36,6 +36,7 @@ jobs:
         run: "bash scripts/dev/ci/run.sh ${{ matrix.testenv }}"
 
   tests-docker:
+    if: false  # FIXME
     runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
@@ -56,11 +57,55 @@ jobs:
       - uses: actions/checkout@v2
       - run: tox -e py38
 
-
-  # tests:
-  #   strategy:
-  #     fail-fast: false
-  #     matrix:
-  #       include:
-  #         ### PyQt 5.7.1 (Python 3.5)
-  #         - os: ubuntu-16.04
+  tests:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          ### PyQt 5.7.1 (Python 3.5)
+          - os: ubuntu-16.04
+            python: 3.5
+            testenv: py35-pyqt57
+          ### PyQt 5.9 (Python 3.6)
+          - os: ubuntu-20.04
+            python: 3.6
+            testenv: py36-pyqt59
+          ### PyQt 5.10 (Python 3.6)
+          - os: ubuntu-20.04
+            python: 3.6
+            testenv: py36-pyqt510
+          ### PyQt 5.11 (Python 3.7)
+          - os: ubuntu-20.04
+            python: 3.7
+            testenv: py37-pyqt511
+          ### PyQt 5.12 (Python 3.8)
+          - os: ubuntu-20.04
+            python: 3.8
+            testenv: py38-pyqt512
+          ### PyQt 5.13 (Python 3.8)
+          - os: ubuntu-20.04
+            python: 3.8
+            testenv: py38-pyqt513
+          ### PyQt 5.14 (Python 3.8)
+          - os: ubuntu-20.04
+            python: 3.8
+            testenv: py38-pyqt514
+          ### PyQt 5.15 (Python 3.8)
+          - os: ubuntu-20.04
+            python: 3.8
+            testenv: py38-pyqt515
+          ### TODO: macOS
+          ### TODO: Windows
+          ### TODO: coverage
+    runs-on: "${{ matrix.os }}"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: "${{ matrix.python }}"
+      - name: Install apt dependencies
+        run: sudo apt install libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0
+      - name: Install dependencies
+        run: "bash scripts/dev/ci/install.sh ${{ matrix.testenv }}"
+      - name: "Run ${{ matrix.testenv }}"
+        run: "bash scripts/dev/ci/run.sh ${{ matrix.testenv }}"