Limiting GHA to java 8 and 11 for now

Author: mseaton

.github/workflows/build.yml

@@ -14,6 +14,9 @@ concurrency:
 jobs:
   build:
     uses: openmrs/openmrs-contrib-gha-workflows/.github/workflows/build-backend-module.yml@main
+    with:
+      java_versions: '[8, 11]'
+      main_java_version: '11'
     secrets:
       MAVEN_REPO_USERNAME: ${{ secrets.MAVEN_REPO_USERNAME }}
       MAVEN_REPO_API_KEY: ${{ secrets.MAVEN_REPO_API_KEY }}