Fix readlink errors

Author: fuzziebrain

01-stage.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-BASE_DIR=$(readlink -f $0 | xargs dirname)
+BASE_DIR=$(readlink -f -- "$0" | xargs dirname)
 
 if [ -d 'dockerfiles' ]; then
   rm -rf dockerfiles;
@@ -17,4 +17,4 @@ echo "##### Staging RPM #####"
 cd dockerfiles/18.4.0 && curl --progress-bar -O file://$BASE_DIR/files/oracle-database-xe-18c-1.0-1.x86_64.rpm
 
 cd $BASE_DIR
-echo "##### Done #####"
+echo "##### Done #####"