fix(kotlin-runtime): correctly determine port for FTL endpoint (#464)

Also close TODO for supporting https.

bin/hermit.hcl

@@ -1,8 +1,7 @@
 env = {
   "FTL_ENDPOINT": "http://localhost:8892",
   "FTL_SOURCE": "${HERMIT_ENV}",
-  "GOOSE_DBSTRING": "postgres://postgres:[email protected]:5432/ftl",
-  "GOOSE_DRIVER": "postgres",
+  "OTEL_METRIC_EXPORT_INTERVAL": "5000",
   "PATH": "${HERMIT_ENV}/scripts:${HERMIT_ENV}/console/client/node_modules/.bin:${PATH}",
 }
 sources = ["env:///bin/packages", "https://github.com/cashapp/hermit-packages.git"]

kotlin-runtime/ftl-runtime/src/main/kotlin/xyz/block/ftl/client/grpc.kt

@@ -11,13 +11,18 @@ import java.util.concurrent.TimeUnit.SECONDS
 
 internal fun makeGrpcClient(endpoint: String): ManagedChannel {
   val url = URL(endpoint)
-  // TODO: Check if URL is https and use SSL?
-  return NettyChannelBuilder
-    .forAddress(InetSocketAddress(url.host, url.port))
+  val port = if (url.port == -1) when (url.protocol) {
+    "http" -> 80
+    "https" -> 443
+    else -> throw IllegalArgumentException("Unsupported protocol: ${url.protocol}")
+  } else url.port
+  var builder = NettyChannelBuilder
+    .forAddress(InetSocketAddress(url.host, port))
     .keepAliveTime(5, SECONDS)
     .intercept(VerbServiceClientInterceptor())
-    .usePlaintext()
-    .build()
+  if (url.protocol == "http")
+    builder = builder.usePlaintext()
+  return builder.build()
 }
 
 private class VerbServiceClientInterceptor : ClientInterceptor {