Enable GHA "Checks" for 17u

[Severin Gehwolf]

Hi,

On Tue, 2021-08-24 at 13:57 +0200, Aleksey Shipilev wrote:
> Hi,
> 
> JDK 17u workspace has GHA workflows enabled, so it can be tested.
> 
> For example, this is the run for recent backport:
>    https://github.com/shipilev/jdk17u/actions/runs/1158027935
> 
> However, the "Checks" tab in PR does not show it:
>    https://github.com/openjdk/jdk17u/pull/35
> 
> I believe it requires a bit of configuration nudge (in 17u Skara bots?).
> Christoph, do you remember what you did in 11u for this?

Not Christoph, but the Skara issue for this work was:
https://bugs.openjdk.java.net/browse/SKARA-1124

I'd expect for 17u to require similar config.

Thanks,
Severin