ssl: Fix resolving path to builtin ssl certs if not overwritten

lib/config.mjs

@@ -1,4 +1,6 @@
 import fs from 'fs'
+import path from 'path'
+import { fileURLToPath } from 'url'
 import Nconf from 'nconf-lite'
 
 const nconf = new Nconf()
@@ -27,6 +29,8 @@ if (fs.existsSync(filename)) {
   nconf.file('main', nconf.get('config') || '../config.json');
 }
 
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+
 // Default variables
 nconf.defaults({
   name: nconf.get('name') || 'spserver',
@@ -40,8 +44,8 @@ nconf.defaults({
       level: 'info',
     },
   },
-  sslkey: 'key.pem',
-  sslcert: 'cert.pem',
+  sslkey: path.resolve(path.join(__dirname, '../key.pem')),
+  sslcert: path.resolve(path.join(__dirname, '../cert.pem')),
   development: {
     port: 3001,
     bunyan: {