[FAB-5576] -f flag to choose docker-compose on byfn.sh

Using the -f flag is possible to specify the docker-compose file to use on the
byfn.sh script to have a standar way to test the different configurations for
the samples project. The defautl is 'docker-compose-cli.yaml'

-h output updated as well.

Fix Issue # FAB-5576.

Change-Id: I8766ab930f05d9c4934b149872b9de3a299ff345
Signed-off-by: dsanchezseco <d.seco@protonmail.com>

first-network/byfn.sh

@@ -34,7 +34,7 @@ export FABRIC_CFG_PATH=${PWD}
 # Print the usage message
 function printHelp () {
   echo "Usage: "
-  echo "  byfn.sh -m up|down|restart|generate [-c <channel name>] [-t <timeout>] [-d <delay>] "
+  echo "  byfn.sh -m up|down|restart|generate [-c <channel name>] [-t <timeout>] [-d <delay>] [-f <docker-compose-file>]"
   echo "  byfn.sh -h|--help (print this message)"
   echo "    -m <mode> - one of 'up', 'down', 'restart' or 'generate'"
   echo "      - 'up' - bring up the network with docker-compose up"
@@ -44,6 +44,7 @@ function printHelp () {
   echo "    -c <channel name> - channel name to use (defaults to \"mychannel\")"
   echo "    -t <timeout> - CLI timeout duration in microseconds (defaults to 10000)"
   echo "    -d <delay> - delay duration in seconds (defaults to 3)"
+  echo "    -f <docker-compose-file> - specify which docker-compose file use (defaults to docker-compose-cli.yaml)"
   echo
   echo "Typically, one would first generate the required certificates and "
   echo "genesis block, then bring up the network. e.g.:"
@@ -318,6 +319,8 @@ while getopts "h?m:c:t:d:" opt; do
     ;;
     d)  CLI_DELAY=$OPTARG
     ;;
+    f)  COMPOSE_FILE=$OPTARG
+    ;;
   esac
 done