Speed up deploy process

"bundle install" was running on the deploy steps where it wasn't needed.

Moved the "bundle install" into the build step and sourced the deploy
steps from the tiny "alpine" base image.

.gitlab-ci.yml

-image: ruby:2.3
-
 stages:
   - build
   - deploy
@@ -7,32 +5,31 @@ stages:
 variables:
   JEKYLL_ENV: production
 
-before_script:
-  - cd srctweb/
-  - bundle install
-
 build:
+  image: ruby:2.3
   stage: build
-  before_script:
-  - cd srctweb/
-  - bundle install
   script:
-  - bundle exec jekyll build --trace -d '../build'
+    - cd srctweb/
+    - bundle install
+    - bundle exec jekyll build --trace -d '../build'
   artifacts:
     paths:
-    - build
+      - build
     
 deploy_staging:
+  image: alpine
   stage: deploy
   script:
-  - echo 'Deploy bot awayyy';
+    - echo 'Deploy bot awayyy';
   environment:
     name: staging
     url: https://srct.gmu.io
 
 deploy_production:
+  image: alpine
   stage: deploy
-  script: echo "Deploy bot awayyyyy"
+  script:
+    - echo "Deploy bot awayyyyy"
   environment:
     name: production
     url: https://srct.gmu.edu