Set user email with ETH address while authenticating (#5)

Part of [Service provider auctions for web deployments](https://www.notion.so/Service-provider-auctions-for-web-deployments-104a6b22d47280dbad51d28aa3a91d75)

Reviewed-on: cerc-io/snowballtools-base#5
Co-authored-by: Nabarun <nabarun@deepstacksoft.com>
Co-committed-by: Nabarun <nabarun@deepstacksoft.com>

packages/backend/environments/local.toml.example

@@ -4,8 +4,11 @@
   gqlPath = "/graphql"
   [server.session]
     secret = ""
+    # Frontend webapp URL origin
     appOriginUrl = "http://localhost:3000"
+    # Set to true if server running behind proxy
     trustProxy = false
+    # Backend URL hostname
     domain = "localhost"
 
 [database]