Add testing coverage for payjoin-service

This just ensures that the testing sacffolding is in place for the new
payjoin-service to be run in the CI as it fills out.

Author: benalleng

contrib/test.sh

@@ -24,7 +24,7 @@ if [ -f "$LOCKFILE" ]; then
 fi
 
 DEPS="recent minimal"
-CRATES="ohttp-relay payjoin payjoin-cli payjoin-directory payjoin-ffi"
+CRATES="ohttp-relay payjoin payjoin-cli payjoin-directory payjoin-ffi payjoin-service"
 
 for dep in $DEPS; do
     cargo --version

payjoin-service/contrib/test.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+set -e
+
+cargo test --locked --package payjoin-service --verbose --all-features --lib