CI: Add Cirrus-CI config for FreeBSD builds

.cirrus.yml

@@ -0,0 +1,21 @@
+# $FreeBSD$
+
+freebsd_instance:
+  image: freebsd-12-1-release-amd64
+
+env:
+  CIRRUS_CLONE_DEPTH: 1
+
+task:
+  install_script:
+  - pkg install -y
+    v4l_compat swig30 ffmpeg curl dbus fdk-aac fontconfig
+    freetype2 jackit jansson luajit mbedtls pulseaudio speexdsp
+    libsysinfo libudev-devd libv4l libx264 cmake ninja
+    mesa-libs lua52 pkgconf
+    qt5-svg qt5-qmake qt5-buildtools qt5-x11extras
+  script:
+  - mkdir build
+  - cd build
+  - cmake -DUNIX_STRUCTURE=1 -GNinja ..
+  - ninja