change the config-gateway format

[dprotaso]

This puts the configuration in line with what we did in net-istio - details are here knative-extensions/net-istio#1247

but tl;dr we changed the gateway config to take a list of gateways. This will allow us to do label filtering of gateways in the future without breaking the config format.

For now we restrict the number of gateways to a single one.

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 78.29%. Comparing base (cd525ad) to head (52351d2).
Report is 33 commits behind head on main.

Files	Patch %	Lines
pkg/reconciler/ingress/ingress.go	64.70%	6 Missing ⚠️
pkg/reconciler/ingress/config/gateway.go	94.28%	4 Missing ⚠️
pkg/reconciler/ingress/config/store.go	0.00%	3 Missing ⚠️
pkg/reconciler/ingress/lister.go	88.88%	1 Missing ⚠️
pkg/reconciler/ingress/reconcile_resources.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #701       +/-   ##
===========================================
+ Coverage   66.97%   78.29%   +11.31%     
===========================================
  Files          15       16        +1     
  Lines         863     1230      +367     
===========================================
+ Hits          578      963      +385     
+ Misses        254      229       -25     
- Partials       31       38        +7     

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[izabelacg]

/lgtm
/hold for tests

[dprotaso]

Reset PR to pull in latest fixes in the main branch

[dprotaso]

all good now
@izabelacg PTAL again

/hold cancel

[dprotaso]

/override "Generate some code!"
/override "style / suggester / github_actions"

Workaround for prow merging being broken - knative/infra#411

[knative-prow]

@dprotaso: Overrode contexts on behalf of dprotaso: Generate some code!, style / suggester / github_actions

In response to this:

/override "Generate some code!"
/override "style / suggester / github_actions"

Workaround for prow merging being broken - knative/infra#411

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[izabelacg]

/lgtm