Migrate release process from travis to github (#175)

* set fetch depth to 0
* Only snapshot when not tagged
* Run deploy for v* tags
* travis: remove deploy stage

.travis.yml

@@ -25,22 +25,6 @@ jobs:
       script:
         - "elm-format --validate ."
         - "npm run build"
-    - stage: deploy
-      go: "1.15.x"
-      before_install:
-        - "nvm install 10.19.0"
-      install:
-        - "cd ui"
-        - "npm ci"
-        - "npm run build"
-        - "cd .."
-      script: "curl -sL https://git.io/goreleaser | bash"
-      addons:
-        apt:
-          packages:
-            - rpm
 
 stages:
   - test
-  - name: deploy
-    if: tag IS present