Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -1,6 +1,5 @@
-image: ubuntu
-
 pages:
+  image: ubuntu
   script:
   - cd doxygen/
   - apt update && apt install -y git doxygen python3-pip
@@ -13,3 +12,20 @@ pages:
     - public
   only:
   - master
+
+publish:
+  image: python:3.6
+  only:
+    - tags
+  script:
+    - "pip install -U platformio"
+    - "cd CodeRacer_MKII"
+    - "pio package publish"
+
+release:
+  image: inetprocess/gitlab-release
+  stage: release
+  only:
+    - tags
+  script:
+    - gitlab-release --message ''