publish snapshot versions on main merge

.github/workflows/gradle.yml

@@ -9,9 +9,9 @@ name: Java CI with Gradle
 
 on:
   push:
-    branches: [ master ]
+    branches: [ master, main ]
   pull_request:
-    branches: [ master ]
+    branches: [ master, main ]
 
 permissions:
   contents: read
@@ -32,3 +32,15 @@ jobs:
       uses: gradle/gradle-build-action@0d13054264b0bb894ded474f08ebb30921341cee
       with:
         arguments: build
+
+
+    # The USERNAME and TOKEN need to correspond to the credentials environment variables used in
+    # the publishing section of your build.gradle
+    - name: Publish to GitHub Packages
+      uses: gradle/gradle-build-action@0d13054264b0bb894ded474f08ebb30921341cee
+      with:
+        arguments: publish
+      env:
+        snapshot: 1
+        USERNAME: ${{ github.actor }}
+        TOKEN: ${{ secrets.GITHUB_TOKEN }}