Fix(logger): Ignore docker health check requests

This patch disables logging of HTTP requests containing
health-check UA from the local IP address. These logs
can take up a lot of disk space but are of little use.

Signed-off-by: Chongyun Lee <uchkks@protonmail.com>

app.js

@@ -63,8 +63,14 @@ if (!config.useSSL && config.protocolUseSSL) {
   app.set('trust proxy', 1)
 }
 
+// check if the request is from container healthcheck
+function isContainerHealthCheck (req, _) {
+  return req.headers['user-agent'] === 'hedgedoc-container-healthcheck/1.0' && req.ip === '127.0.0.1'
+}
+
 // logger
 app.use(morgan('combined', {
+  skip: isContainerHealthCheck,
   stream: logger.stream
 }))