Move to GitHub actions

.github/workflows/main.yml

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+name: Continuous integration build
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  compile:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        CC: [ gcc, clang ]
+        OS: [ "alpine:edge", "archlinux:base-devel" ]
+        xwayland: [ true, false ]
+    container: ${{ matrix.OS }}
+    env:
+      CC: ${{ matrix.CC }}
+    steps:
+      - name: Checkout Cage
+        uses: actions/checkout@v2
+
+      - name: Install dependencies (Alpine)
+        if: "matrix.OS == 'alpine:edge'"
+        run: apk add build-base xcb-util-wm-dev libseat-dev clang git eudev-dev mesa-dev libdrm-dev libinput-dev libxkbcommon-dev pixman-dev wayland-dev meson wayland-protocols xwayland scdoc-doc
+
+      - name: Install dependencies (Arch)
+        if: "matrix.OS == 'archlinux:base-devel'"
+        run: |
+          pacman-key --init
+          pacman -Syu --noconfirm xcb-util-wm seatd git clang meson libinput libdrm mesa libxkbcommon wayland wayland-protocols xorg-server-xwayland scdoc
+
+      - name: Fetch wlroots as a subproject
+        run: git clone https://gitlab.freedesktop.org/wlroots/wlroots.git subprojects/wlroots -b 0.14.0
+
+      # TODO: use --fatal-meson-warnings when on wlroots 0.15.0
+      - name: Compile Cage (XWayland=${{ matrix.xwayland }})
+        run: |
+          meson build-${{ matrix.CC }}-${{matrix.xwayland }} -Dxwayland=${{ matrix.xwayland }}
+          ninja -C build-${{ matrix.CC }}-${{matrix.xwayland }}
+
+  format:
+    runs-on: ubuntu-latest
+    container: "archlinux:base-devel"
+    steps:
+      - name: Checkout Cage
+        uses: actions/checkout@v2
+      - name: Install dependencies
+        run: |
+          pacman-key --init
+          pacman -Syu --noconfirm xcb-util-wm seatd git clang meson libinput libdrm mesa libxkbcommon wayland wayland-protocols xorg-server-xwayland scdoc
+      - name: Fetch wlroots as a subproject
+        run: git clone https://gitlab.freedesktop.org/wlroots/wlroots.git subprojects/wlroots -b 0.14.0
+      - name: Check for formatting changes
+        run: |
+          meson build-clang-format -Dxwayland=true
+          ninja -C build-clang-format clang-format-check
+
+  scan-build:
+    runs-on: ubuntu-latest
+    container: "archlinux:base-devel"
+    env:
+      CC: clang
+    steps:
+      - name: Checkout Cage
+        uses: actions/checkout@v2
+      - name: Install dependencies
+        run: |
+          pacman-key --init
+          pacman -Syu --noconfirm xcb-util-wm seatd git clang meson libinput libdrm mesa libxkbcommon wayland wayland-protocols xorg-server-xwayland scdoc
+      - name: Fetch wlroots as a subproject
+        run: git clone https://gitlab.freedesktop.org/wlroots/wlroots.git subprojects/wlroots -b 0.14.0
+      - name: Run scan-build
+        run: |
+          meson build-scan-build -Dxwayland=true
+          ninja -C build-scan-build scan-build