Add Gitlab-CI for testing

.gitlab-ci.yml

+image: "rust:alpine"
+
+services:
+  - mysql:latest
+
+stages:
+  - build
+  - test
+
+variables:
+  MYSQL_DATABASE: test
+  MYSQL_ROOT_PASSWORD: test_database
+  DATABASE_URL: mysql://root:$MYSQL_ROOT_PASSWORD@mysql/$MYSQL_DATABASE
+
+build:
+  stage: build
+  script:
+    - apk add zeromq
+
+test:cargo:
+  stage: test
+  script:
+    - rustc --version && cargo --version 
+    - cargo test --all
+    - cargo run -- iff
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