Fix ci publish

Author: jvalkeal

.github/workflows/ci.yml

@@ -40,6 +40,9 @@ jobs:
     needs: [build]
     steps:
       - uses: actions/checkout@v2
+      - uses: jvalkeal/setup-maven@v1
+        with:
+          maven-version: 3.8.4
       - uses: actions/setup-java@v2
         with:
           distribution: adopt