Update publish.yml (#46)

fixed syntax error

Author: ethan-wrasman-pkware

.github/workflows/publish.yml

@@ -29,7 +29,7 @@ jobs:
           ORG_GRADLE_PROJECT_SIGNING_PASSWORD: ${{ secrets.SIGNING_PASSWORD }}
 
       - name: Notify Central Publisher Portal
-        if: !contains(github.ref, 'SNAPSHOT')
+        if: contains(github.ref, 'SNAPSHOT') == false
         run: |
           token=$(echo -n "${{ secrets.NEXUS_USERNAME }}:${{ secrets.NEXUS_PASSWORD }}" | base64)
           curl -X POST \