add metrics middleware to ogcard service

bskyogcard/src/config.ts

@@ -6,6 +6,7 @@ export type Config = {
 
 export type ServiceConfig = {
   port: number
+  metricsPort: number
   version?: string
   appviewUrl: string
   originVerify?: string
@@ -13,6 +14,7 @@ export type ServiceConfig = {
 
 export type Environment = {
   port?: number
+  metricsPort?: number
   version?: string
   appviewUrl?: string
   originVerify?: string
@@ -21,6 +23,7 @@ export type Environment = {
 export const readEnv = (): Environment => {
   return {
     port: envInt('CARD_PORT'),
+    metricsPort: envInt('CARD_METRICS_PORT'),
     version: envStr('CARD_VERSION'),
     appviewUrl: envStr('CARD_APPVIEW_URL'),
     originVerify: envStr('CARD_ORIGIN_VERIFY'),
@@ -30,6 +33,7 @@ export const readEnv = (): Environment => {
 export const envToCfg = (env: Environment): Config => {
   const serviceCfg: ServiceConfig = {
     port: env.port ?? 3000,
+    metricsPort: env.metricsPort ?? 3001,
     version: env.version,
     appviewUrl: env.appviewUrl ?? 'https://api.bsky.app',
     originVerify: env.originVerify,