Exempt /healthz from middleware

Signed-off-by: Brett Logan <lindluni@github.com>

index.js

@@ -1,6 +1,7 @@
 import express from 'express'
 import {limiter} from './src/limiter.js'
 import {processWebhook, respond} from './src/routes.js'
+import {unless} from './src/utils.js'
 import {
     debugRequest,
     hydrateKey,
@@ -13,17 +14,18 @@ import {
 } from './src/middleware.js'
 
 const app = express()
+app.use(unless('/healthz'), express.json())
+app.use(unless('/healthz'), debugRequest)
+app.use(unless('/healthz'), hydrateKey)
+app.use(unless('/healthz'), limiter)
+app.use(unless('/healthz'), verifyIsPR)
+app.use(unless('/healthz'), verifyIssueCommentCreatedEvent)
+app.use(unless('/healthz'), verifyGitHubWebhook)
+app.use(unless('/healthz'), verifyMembership)
+app.use(unless('/healthz'), verifyCommand)
+app.use(unless('/healthz'), hydrateOctokit)
+
 app.get('/healthz', respond)
-app.use(express.json())
-app.use(debugRequest)
-app.use(hydrateKey)
-app.use(limiter)
-app.use(verifyIsPR)
-app.use(verifyIssueCommentCreatedEvent)
-app.use(verifyGitHubWebhook)
-app.use(verifyMembership)
-app.use(verifyCommand)
-app.use(hydrateOctokit)
 app.post('/api/github/webhooks', processWebhook)
 
 const main = async () => {