SCYLLA-VERSION-GEN: do not print version by default

actually, we never use the its output in our workflow. and the
output is distracting when building the package. so, in this
change, let's print it only on demand. this feature is preserved
just in case some of us would want to use this script for getting
the version number string.

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

Closes #15327

SCYLLA-VERSION-GEN

@@ -7,6 +7,7 @@ Options:
   -h|--help show this help message.
   -o|--output-dir PATH specify destination path at which the version files are to be created.
   -d|--date-stamp DATE manually set date for release parameter
+  -v|--verbose also print out the version number
 
 By default, the script will attempt to parse 'version' file
 in the current directory, which should contain a string of
@@ -33,6 +34,7 @@ END
 )
 
 DATE=""
+PRINT_VERSION=false
 
 while [ $# -gt 0 ]; do
 	opt="$1"
@@ -51,6 +53,10 @@ while [ $# -gt 0 ]; do
 			shift
 			shift
 			;;
+		-v|--verbose)
+			PRINT_VERSION=true
+			shift
+			;;
 		*)
 			echo "Unexpected argument found: $1"
 			echo
@@ -102,7 +108,9 @@ if [ -f "$OUTPUT_DIR/SCYLLA-RELEASE-FILE" ]; then
 	fi
 fi
 
-echo "$SCYLLA_VERSION-$SCYLLA_RELEASE"
+if $PRINT_VERSION; then
+	echo "$SCYLLA_VERSION-$SCYLLA_RELEASE"
+fi
 mkdir -p "$OUTPUT_DIR"
 echo "$SCYLLA_VERSION" > "$OUTPUT_DIR/SCYLLA-VERSION-FILE"
 echo "$SCYLLA_RELEASE" > "$OUTPUT_DIR/SCYLLA-RELEASE-FILE"