Limit maven memory on CI

Maven process spawns sub processes, including tests processes, so it's
important that the maven process uses limited memory, as the whole
node's memory isn't unbounded.

This restores maven memory settings as of before commit
f133a42.

.github/workflows/ci.yml

@@ -19,8 +19,8 @@ env:
   CONTINUOUS_INTEGRATION: true
   # allow overriding Maven command
   MAVEN: ./mvnw
-  MAVEN_OPTS: ""
-  MAVEN_INSTALL_OPTS: ""
+  MAVEN_OPTS: "-Xmx512M -XX:+ExitOnOutOfMemoryError"
+  MAVEN_INSTALL_OPTS: "-Xmx3G -XX:+ExitOnOutOfMemoryError"
   MAVEN_FAST_INSTALL: "-B -V --quiet -T 1C -DskipTests -Dmaven.source.skip=true -Dair.check.skip-all"
   MAVEN_COMPILE_COMMITS: "-B --quiet -T 1C -DskipTests -Dmaven.source.skip=true -Dair.check.skip-all=true -Dmaven.javadoc.skip=true --no-snapshot-updates --no-transfer-progress -pl '!:trino-server-rpm'"
   MAVEN_GIB: "-P gib -Dgib.referenceBranch=refs/remotes/origin/${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref || github.event.repository.default_branch }}"