Rename UID and GID env variables in the acceptance compose scripts

with UID and GID, I'm getting the following error in macos, renamed
as GSUID and GSGID.

```
UID: readonly variable
```

compose/acceptance_datadir

@@ -1,9 +1,9 @@
 #/bin/bash
 
-UID=$(id -u)
-GID=$(id -g)
+GSUID=$(id -u)
+GSGID=$(id -g)
 
-GS_USER=$UID:$GID COMPOSE_PROJECT_NAME=gscloud-acceptance-datadir \
+GS_USER=$GSUID:$GSGID COMPOSE_PROJECT_NAME=gscloud-acceptance-datadir \
 docker compose \
 -f compose.yml \
 -f catalog-datadir.yml \

compose/catalog-datadir.yml

@@ -17,7 +17,7 @@ services:
   init-datadir:
     image: alpine:3.18.4
     user: ${GS_USER}
-    command: sh -c "cd /opt/app/data_directory; if [ ! -f global.xml ]; then tar xfvz /tmp/datadir.tgz; fi"
+    command: sh -c "cd /opt/app/data_directory; if [ ! -f global.xml ]; then tar xvzf /tmp/datadir.tgz; fi"
     volumes:
       - datadir:/opt/app/data_directory
       - ./catalog-datadir.tgz:/tmp/datadir.tgz