Squashed 'clipmenu/' content from commit e0ec3bc6

git-subtree-dir: clipmenu
git-subtree-split: e0ec3bc6608ecc70ed17e8da76e27bf90b1e8e90

.github/workflows/ci.yml

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+jobs:
+  build_and_test:
+    name: CI
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - run: sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+      - run: sudo apt-get update
+
+      - uses: awalsh128/cache-apt-pkgs-action@v1
+        with:
+          packages: gcc-10 clang clang-format clang-tidy cppcheck xvfb xsel libxfixes-dev libx11-dev
+          version: 1.0
+
+      - run: gcc --version
+
+      - run: make clean analyse
+      - run: make tests
+      - run: make integration_tests
+        env:
+          NO_PID_NAMESPACE: 1
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch: