Add Supplier Exporter sample

spring-cloud-function-samples/function-sample-supplier-exporter/build.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+BLUE='\033[0;34m'
+NC='\033[0m'
+
+printf "=== ${BLUE}Building %s sample${NC} ===\n" "${PWD##*/}"
+
+./compile.sh || exit 1
+
+JARDIR=target/native-image
+java -cp $JARDIR/BOOT-INF/lib/*:$JARDIR/BOOT-INF/classes:$JARDIR:target/test-classes com.example.test.TestServer &
+SPID=$!
+sleep 5
+
+${PWD%/*samples/*}/scripts/test.sh --spring.cloud.function.web.export.source.url=http://localhost:8000/home --spring.cloud.function.web.export.sink.url=http://localhost:8000/echo
+
+kill $SPID