chore(): Improves script logic with better debugging

scripts/get-scan-report

@@ -14,26 +14,31 @@ printf "Found digests for scan report...\n"
 
 extra_vars=""
 
-if env | grep REGISTRY_USERNAME > /dev/null;
-then
+if [ ! -z $REGISTRY_USERNAME ]; then
+    printf "Found registry username...\n"
     extra_vars="$extra_vars --username $REGISTRY_USERNAME"
 fi
 
-if env | grep REGISTRY_PASSWORD > /dev/null;
-then
+if [ ! -z REGISTRY_PASSWORD ]; then
+    printf "Found registry password\n"
     extra_vars="$extra_vars --password $REGISTRY_PASSWORD "
 fi
 
+
+printf "Cleaning result file, if it already exists...\n"
+if [ -e result.json ]; then
+    rm result.json
+fi
+
 image_base=$(echo "$image" | awk -F ':' '{print $1}')
 printf "Pulling $image_base:@$report_digest...\n"
-
-if [ -e result.json ]; then
-    rm result.json
-fi
 oras pull $extra_vars $image_base:@$report_digest
 
+printf "Checking for result file..."
 if [ -e result.json ]; then
+    printf "Result file found !"
     exit 0
 else
+    printf "Result file not found !"
     exit 1
 fi