Ensure datapacks cleanup doesn't remove vanillatweaks (#2262)

scripts/start-setupDatapack

@@ -2,6 +2,8 @@
 
 set -e -o pipefail
 
+: "${VANILLATWEAKS_FILE:=}"
+: "${VANILLATWEAKS_SHARECODE:=}"
 : "${REMOVE_OLD_DATAPACKS:=false}"
 : "${DATAPACKS_FILE:=}"
 : "${REMOVE_OLD_DATAPACKS_DEPTH:=1} "
@@ -74,4 +76,12 @@ elif [[ "$DATAPACKS_FILE" ]]; then
   fi
 fi
 
+if [[ ${VANILLATWEAKS_FILE} || ${VANILLATWEAKS_SHARECODE} ]]; then
+  mc-image-helper vanillatweaks \
+    --output-directory="/data" \
+    --world-subdir="${LEVEL:-world}" \
+    --share-codes="$VANILLATWEAKS_SHARECODE" \
+    --pack-files="$VANILLATWEAKS_FILE"
+fi
+
 exec "${SCRIPTS:-/}start-setupForgeApiMods" "$@"