Add cirrus CI

.cirrus.yml

@@ -0,0 +1,18 @@
+task:
+  container:
+    image: archlinux:base-devel
+
+  matrix:
+    - name: Build (clang)
+      script:
+        - sudo pacman --noconfirm -Syu
+        - sudo pacman --noconfirm -S git meson ninja lua51 wlroots wayland-protocols
+        - meson build -Dlua-pkg=lua51
+        - ninja -C build
+
+    - name: Format
+      script:
+        - sudo pacman --noconfirm -Syu
+        - sudo pacman --noconfirm -S clang git
+        - clang-format -i **/*.{c,h}
+        - git diff --exit-code

.editorconfig

@@ -11,3 +11,7 @@ tab_width = 4
 [meson.build]
 indent_size = 2
 tab_width = 2
+
+[*.yml]
+indent_size = 2
+tab_width = 2