CI: Add initial gitlab-ci config

Duplicates the functionality of the travis config

.gitlab-ci.yml

@@ -0,0 +1,51 @@
+stages:
+  - "test"
+
+.cargo_test_template: &cargo_test
+  stage: "test"
+  variables:
+    DEPENDENCIES: |
+      curl
+      liborc-dev
+      libglib2.0-dev
+      libxml2-dev
+      libgtk-3-dev
+      libegl1-mesa
+      libgles2-mesa
+      libgl1-mesa-dri
+      libgl1-mesa-glx
+      libwayland-egl1-mesa
+
+  before_script:
+    - apt-get update -yqq
+    - apt-get install -yqq --no-install-recommends $DEPENDENCIES
+    - mkdir -p precompiled-gst && cd precompiled-gst
+
+    - curl -L https://people.freedesktop.org/~slomo/gstreamer-1.14.3.tar.gz | tar xz
+    - sed -i "s;prefix=/root/gstreamer;prefix=$PWD/gstreamer;g" $PWD/gstreamer/lib/x86_64-linux-gnu/pkgconfig/*.pc
+    - export PKG_CONFIG_PATH=$PWD/gstreamer/lib/x86_64-linux-gnu/pkgconfig
+    - export GST_PLUGIN_SYSTEM_PATH=$PWD/gstreamer/lib/x86_64-linux-gnu/gstreamer-1.0
+    - export GST_PLUGIN_SCANNER=$PWD/gstreamer/libexec/gstreamer-1.0/gst-plugin-scanner
+    - export PATH=$PATH:$PWD/gstreamer/bin
+    - export LD_LIBRARY_PATH=$PWD/gstreamer/lib/x86_64-linux-gnu:$LD_LIBRARY_PATH
+  script:
+    - rustc --version
+    - cargo build --all
+    - G_DEBUG=fatal_warnings cargo test --all
+    - cargo build --all --all-features
+    - G_DEBUG=fatal_warnings cargo test --all --all-features
+
+
+test stable:
+  # Stable img
+  # https://hub.docker.com/_/rust/
+  image: "rust:slim"
+  <<: *cargo_test
+
+test nightly:
+  # Nightly
+  # https://hub.docker.com/r/rustlang/rust/
+  image: "rustlang/rust:nightly-slim"
+  allow_failure: true
+  <<: *cargo_test
+