Switch from maven:alpine to maven docker image for generating javadocs when publishing the site
diff --git a/site/docker-compose.yml b/site/docker-compose.yml
index 47b3a2d..c14dd44 100644
--- a/site/docker-compose.yml
+++ b/site/docker-compose.yml
@@ -28,7 +28,7 @@
     volumes:
       - .:/srv/jekyll
   generate-javadoc:
-    image: maven:alpine
+    image: maven
     working_dir: /usr/src/calcite-avatica
     command: sh -c "mvn -DskipTests -P!compile-protobuf site; rm -rf site/target/avatica/apidocs site/target/avatica/testapidocs; mkdir -p site/target/avatica; mv target/site/apidocs target/site/testapidocs site/target/avatica"
     volumes: