Add verify_maven_central_deployment job

Author: sarahchen6

.gitlab-ci.yml

@@ -880,9 +880,49 @@ requirements_json_test:
 package-oci:
   needs: [ build ]
 
-# Publish OCI images after deployment to Maven Central is successful.
-publishing-gate:
+# Verify Maven Central deployment is publicly available before publishing OCI images
+verify_maven_central_deployment:
+  image: curlimages/curl:8.15.0  # minimum docker image for curling: https://hub.docker.com/r/curlimages/curl
+  stage: publish
   needs: [ deploy_to_maven_central ]
+  rules:
+    - if: '$POPULATE_CACHE'
+      when: never
+    - if: '$CI_COMMIT_TAG =~ /^v[0-9]+\.[0-9]+\.[0-9]+$/'
+      when: on_success
+    - when: manual
+      allow_failure: true
+  script:
+    - |
+      export VERSION=1.51.2 # hardcoded VERSION for testing
+      # export VERSION=${CI_COMMIT_TAG##v}
+      MAVEN_URL="https://repo1.maven.org/maven2/com/datadoghq/dd-java-agent/${VERSION}/dd-java-agent-${VERSION}.jar"
+      echo "Checking URL: $MAVEN_URL"
+      # Wait 30 min for the release to be available
+      TRY=0
+      MAX_TRIES=60
+      DELAY=30
+      while [ $TRY -lt $MAX_TRIES ]; do
+        if curl -s -I "$MAVEN_URL" | grep -q "^HTTP/.* 200"; then
+          break
+        fi
+        sleep $DELAY
+        TRY=$((TRY + 1))
+        if [ $TRY -eq $MAX_TRIES ]; then
+          echo "The release is not available after 30 mins. Manually re-run the job to try again."
+          exit 1
+        fi
+      done
+
+publishing-gate:
+  needs: [ verify_maven_central_deployment ]
+  rules:
+    - if: '$POPULATE_CACHE'
+      when: never
+    - if: '$CI_COMMIT_TAG =~ /^v[0-9]+\.[0-9]+\.[0-9]+$/'
+      when: on_success
+    - when: manual
+      allow_failure: true
 
 configure_system_tests:
   variables: