chore: change cypress settings to run tests in cypress without needing to modify the config

cypress.json

@@ -2,7 +2,7 @@
   "baseUrl": "http://localhost:5000",
   "env": {
     "API_URL": "http://localhost:3456/api/v1",
-    "TEST_SECRET": "testingS3cr3et"
+    "TEST_SECRET": "averyLongSecretToSe33dtheDB"
   },
   "video": false,
   "retries": {

cypress/docker-compose.yml

@@ -2,10 +2,12 @@ version: '3'
 
 services:
   api:
-    image: vikunja/api
+    image: vikunja/api:unstable
     environment:
       VIKUNJA_LOG_LEVEL: DEBUG
       VIKUNJA_SERVICE_TESTINGTOKEN: averyLongSecretToSe33dtheDB
+    ports:
+      - 3456:3456
   cypress:
     image: cypress/browsers:node12.18.3-chrome87-ff82
     volumes: