contrib/startup_regtest: set grpc-port so we can start more than one.

A side-effect of having grpc start by default.  Annoyingly, if it
can't bind it simply exits, with no message, so I had to guess what
was happening.

Reported-by: @daywalker90
Signed-off-by: Rusty Russell <[email protected]>

Author: rustyrussell

contrib/startup_regtest.sh

@@ -72,6 +72,11 @@ else
 	# This mirrors "type" output above.
 fi
 
+# Test for cln-gprc
+if "$LIGHTNINGD" --help | grep -q grpc; then
+    HAVE_GRPC=1
+fi
+
 if [ -z "$LIGHTNING_DIR" ]; then
     # Default is to use the /tmp directory
     LIGHTNING_DIR=/tmp
@@ -206,6 +211,11 @@ funder-lease-requests-only=false
 			echo "clnrest-port=$((3109+i))" >> "$LIGHTNING_DIR/l$i/config"
 		fi
 
+		# Grpc port too
+		if [ -n "$HAVE_GRPC" ]; then
+		    echo "grpc-port=$((9736+i))" >> "$LIGHTNING_DIR/l$i/config"
+		fi
+
 		# Start the lightning nodes
 		test -f "$LIGHTNING_DIR/l$i/lightningd-$network.pid" || \
 			$EATMYDATA "$LIGHTNINGD" "--network=$network" "--lightning-dir=$LIGHTNING_DIR/l$i" "--bitcoin-datadir=$BITCOIN_DIR" "--database-upgrade=true" &