publish only if on publish branch

Author: hernandev

.github/workflows/build.yml

@@ -11,6 +11,7 @@ env:
 on:
   push:
     branches:
+      - master
       - publish
 
 jobs:
@@ -115,6 +116,7 @@ jobs:
 
       # publish to bintray.
       - name: bintray
+        if: github.ref == 'refs/heads/publish'
         run: |
           echo -e "Publishing to Bintray"
           ./publish-zip.sh