[build] make werft fail early when the branch name is too long

[JanKoehnlein]

Is your feature request related to a problem? Please describe

If your branch name for of your PR is too long (>40chars), the certificates for the preview env will not be fetched and the preview env deployment will fail. This is a very late step in the werft build and the error message is usually only visible when you browse the raw logs.

Describe the behaviour you'd like

Werft should fail early and with a well visible error message.

Describe alternatives you've considered

We could also automatically shorten the domain name for the preview env, but I fear that this could open an attack vector via community PRs whose shortened name collides with an existing one.

Additional context

This is an error almost everybody has run into and even experienced Gitpodders stumble upon every now and then.

[svenefftinge]

I'd be in favor of just shortening the identifier.

We could also automatically shorten the domain name for the preview env, but I fear that this could open an attack vector via community PRs whose shortened name collides with an existing one.

Let's figure out if such a possibility exists.

See also #8169

[mads-hartmann]

I believe this is being handled by #8316 (at least the fail early part) /cc @wulfthimm

Lets track finding a way to support longer branch names (e.g. by shortening it as you suggest) in a separate issue (I'll create it)

[mads-hartmann]

@wulfthimm I assigned this to you, please close it when you've merged your PR ☺️

[mads-hartmann]

And here's the follow up issue https://github.com/gitpod-io/ops/issues/1252

[mads-hartmann]

Closing this as we're now failing when branch names are too long. There's a separate issue to figure out how to support long branch names again https://github.com/gitpod-io/ops/issues/1252