Update securityContext to include required configurations when the flag el-security-context is enabled

[savitaashture]

As part of this PR, when the flag el-security-context is enabled the securityContext have all configuration
except RunAsUser and RunAsGroup

Added new fields default-run-as-user and default-run-as-group to config-defaults-triggers configmap so that RunAsUser and RunAsGroup can be now configured through CM

This change handles cases in environments where user ID 65532 is not allowed, such as OpenShift.

Signed-off-by: Savita Ashture sashture@redhat.com

Changes

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• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
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Release Notes

* el-security-context flag will set securityContext except RunAsUser and RunAsGroup
* Added new fields default-run-as-user and default-run-as-group to config-defaults-triggers configmap so that RunAsUser and RunAsGroup can be now configured through CM

[khrm]

/kind feature

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/config/default.go	92.3%	51.9%	-40.5
pkg/reconciler/eventlistener/eventlistener.go	71.3%	71.5%	0.2

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/config/default.go	92.3%	81.5%	-10.8
pkg/reconciler/eventlistener/eventlistener.go	71.3%	71.5%	0.2

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/config/default.go	92.3%	88.9%	-3.4
pkg/reconciler/eventlistener/eventlistener.go	71.3%	71.5%	0.2

[dibyom]

One nit and looks like we need to fix the yaml files. Otherwise, LGTM

pkg/apis/config/testdata/config-defaults-triggers-empty-val.yaml
  24:1      error    too many blank lines (1 > 0)  (empty-lines)
pkg/apis/config/testdata/config-defaults-triggers.yaml
  24:1      error    too many blank lines (1 > 0)  (empty-lines)

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom

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[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/config/default.go	92.3%	88.9%	-3.4
pkg/reconciler/eventlistener/eventlistener.go	71.3%	71.5%	0.2

[savitaashture]

@khrm PTAL
Thank you

[khrm]

/lgtm