Updates Examples for Gateway API Support

[danehans]

Adds a script and includes the script in the generate make target. This is for supporting a Gateway API install experience similar to kubectl apply -f https://projectcontour.io/quickstart/contour.yaml.

Note that examples/render/contour-gateway.yaml was generated from make generate.

Requires #3659

[danehans]

When reviewing, I suggest filtering the commits to separate this PR from #3659.

[codecov]

Codecov Report

Merging #3664 (1432041) into main (8eaf1e8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3664   +/-   ##
=======================================
  Coverage   75.76%   75.76%           
=======================================
  Files         107      107           
  Lines        7327     7327           
=======================================
  Hits         5551     5551           
  Misses       1654     1654           
  Partials      122      122           

[github-actions]

Marking this PR stale since there has been no activity for 14 days. It will be closed if there is no activity for another 30 days.

[stevesloka]

Hey @danehans, this needs a good rebase then can take a look. I think having Gateway examples is a great idea to get folks started. =)

[youngnick]

I think we should try and get this in for 1.16, to help people try out Gateway API functions more easily. I'll add it to milestone + column for now, happy to be overridden here though @xaleeks.

[danehans]

I think we should try and get this in for 1.16, to help people try out Gateway API functions more easily.

@youngnick note that examples are not useful until the gateway controller is implemented (targeted for v1.17.0).

[youngnick]

LGTM now, thanks @danehans