Initial attempt at getting the library to use continual integration.

This will attempt to get the linux build to work on the gitlab
shared runner ci system.

.gitlab-ci.yml

@@ -0,0 +1,16 @@
+before_script:
+   - bundle_install
+
+stages:
+   - build
+   - test
+   - deploy
+
+build_linux:
+   stage: build
+   script:
+      - cargo build
+   only:
+      - master
+   tags:
+      - linux