Create JWK formatted key on startup

boot.py

@@ -19,26 +19,11 @@ def create_quay_service_key(seconds_until_expiration):
   expiration = timedelta(seconds=seconds_until_expiration)
   private_key, service_key = generate_service_key('quay', datetime.now()+expiration)
   approve_service_key(service_key.kid, None, ServiceKeyApprovalType.SUPERUSER)
-
-  private_key_file = {
-    'KeyID': service_key.kid,
-    'PrivateKey': {
-      'N': int(private_key._n),
-      'E': int(private_key._e),
-      'D': int(private_key._d),
-      'Primes': [int(private_key._p), int(private_key._q)],
-      'Precomputed': {
-        'Dp': None,
-        'Dq': None,
-        'Quinv': None,
-        'CRTValues': []
-      }
-    }
-  }
+  jwk = RSAKey(key=private_key).serialize(private=True)
 
   with open('/conf/quay.jwk', mode='w') as f:
     f.truncate(0)
-    f.write(json.dumps(private_key_file))
+    f.write(json.dumps(jwk))
 
 
 def create_jwtproxy_conf():