gitlab-ci: Build and install virtboard

.gitlab-ci.yml

+variables:
+  DEPS: debhelper meson pkg-config libpixman-1-dev libpng-dev libxcb1-dev
+        libxcb-xkb-dev libxkbcommon-dev libcairo2-dev libwayland-dev
+        wayland-protocols
+
+before_script:
+ - apt-get -y update
+ - apt-get -y install $DEPS
+
+build-native:
+  stage: build
+  tags:
+    - librem5
+  script:
+    - export LC_ALL=C.UTF-8
+    - meson . _build
+    - ninja -C _build
+    - ninja -C _build install