Merge pull request #3304 from Gedochao/maintenance/revert-memory-changes-2

Revert Mill & Docker memory changes

Author: Gedochao

.github/scripts/build-linux-aarch64.sh

@@ -16,6 +16,5 @@ docker run $(if test -t 1; then echo "-it"; fi) --rm \
   -w /data \
   -e "CI=$CI" \
   -e "JAVA_OPTS=-Djdk.lang.Process.launchMechanism=vfork" \
-  --memory=8192m \
   ubuntu:20.04 \
     /data/utils/build-linux-aarch64-from-docker.sh

.mill-jvm-opts

@@ -1,4 +1,4 @@
--Xmx4096m
+-Xmx2048m
 -Xms128m
 -Xss8m
 -Dxsbt.skip.cp.lookup=true