change couchdb version to 2.3.1 instead of latest

Latest version of couchdb lead to an error.

docker-compose.yml

@@ -2,7 +2,7 @@ version: '3.0'
 
 services:
   db:
-    image: couchdb:latest
+    image: couchdb:2.3.1
     environment:
       EGL_BASE_URL: ${EGL_BASE_URL}
       EGL_API_AUTH_KEY: ${EGL_API_AUTH_KEY}

env.template

@@ -13,6 +13,7 @@ COZY_ADMIN_PASSPHRASE=mypassword
 
 # The base URL to access EGL API
 EGL_BASE_URL=mybaseurl
+
 # The authentication key for EGL API
 EGL_API_AUTH_KEY=myapiauthkey