[FEATURE] Bad Gateway Error Log instead of page "server initializing message"

[rvald26]

Describe the bug
Getting default nginx gateway error page.

To Reproduce
Createb a utmstack saas instance and try to login to it as soon as the VM is created

Expected behavior
A "UTMStack is initializing or is in maintenance" screen should show, not the default gateway error.

Screenshots

Environment
10.x

[c3s4rfred]

That's because you have to wait for a few minutes, when the stack is starting the nginx responds with that kind of message. We must find a way to know if the stack is completely available.