Update release flow

Author: Itai Gendler

codefresh-release.yml

@@ -7,6 +7,7 @@ steps:
     title: "Update documentation http://cli.codefresh.io"
     image: codefresh/cli-build
     commands:
+      - "yarn install"
       - "echo Building public docs"
       - "yarn build-public-docs"
       - "Push new docs to gh-pages detached branch"