Add Gitlab CI support

.gitlab-ci.yml

@@ -0,0 +1,16 @@
+image: ruby:2.7
+
+workflow:
+  rules:
+    - if: '$CI_COMMIT_BRANCH'
+
+pages:
+  script:
+    - gem install bundler
+    - bundle install
+    - bundle exec jekyll build -d public
+  artifacts:
+    paths:
+      - public
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "master"'

_config.yml

@@ -2,7 +2,8 @@ title: An open letter in support of RMS.
 baseurl: ""
 url: ""
 
-github_username:  rms-support-letter
+github_username: rms-support-letter
+repository: rms-support-letter/rms-support-letter.github.io
 
 # Build settings
 theme: minima