Revert "set heap size to 1gb in Dockerfile"

This reverts commit 106ac97.

Author: walpurr

Dockerfile

@@ -6,6 +6,4 @@ COPY /app .
 
 RUN ["./gradlew", "clean", "build"]
 
-ENV JAVA_OPTS="-Xms1g -Xmx1g"
-
-CMD ["./gradlew", "run", "-Dorg.gradle.jvmargs=-Xms1g -Xmx1g"]
+CMD ["./gradlew", "run"]