Update build_ros2.sh

Output version in `SAS_VERSION`

Author: mmmarinho

.devel/build_ros2.sh

@@ -115,6 +115,7 @@ done
 # Remove any leading zeros otherwise the version name will not fit the bloom requirements
 # https://unix.stackexchange.com/questions/79371/removing-leading-zeros-from-date-output
 VERSION=$(date +"%-y.%-m.%-d%H%M%S")
+echo "version=${VERSION}" > SAS_VERSION
 
 ####################################################################
 #                   Remove current installation
@@ -138,4 +139,4 @@ for pkg_name in "${combined_pkg_array[@]}"; do
   # https://stackoverflow.com/questions/3306007/replace-a-string-in-shell-script-using-a-variable
   sudo dpkg -i ros-"$rosv"-"${pkg_name//_/-}"_*"$ubuntuv"*.deb
   ${var//12345678/$replace}
-done
+done