Add permissions to build workflow

Author: wikumChamith

.github/workflows/build.yml

@@ -14,6 +14,9 @@ concurrency:
 jobs:
   build:
     uses: wikumChamith/openmrs-contrib-gha-workflows/.github/workflows/build-backend-module.yml@infer-version-fallback
+    permissions:
+      contents: read
+      id-token: write
     secrets:
       MAVEN_REPO_USERNAME: ${{ secrets.MAVEN_REPO_USERNAME }}
       MAVEN_REPO_API_KEY: ${{ secrets.MAVEN_REPO_API_KEY }}