[OpenShift] Add param to enable/disable servicemonitor

This adds a param in TektonConfig & TektonPipeline  to disable service monitor
which is a part of TektonPipelines for OpenShift.
Param will be added by default, user can change the value in TektonConfig
to false to disable.

Value is added in openshift extension and not in webhook as this is
platform specific param.

If invalid value is passed then	default	value is set for param to avoid
installation failure. Users can	pass valid values and change the param.

Signed-off-by: Shivam Mukhade <[email protected]>

pkg/apis/operator/v1alpha1/tektonconfig_defaults.go

@@ -28,4 +28,20 @@ func (tc *TektonConfig) SetDefaults(ctx context.Context) {
 	tc.Spec.Pipeline.PipelineProperties.setDefaults()
 
 	setAddonDefaults(&tc.Spec.Addon.Params)
+
+	// before adding webhook we had default value for pruner's keep as 1
+	// but we expect user to define all values now otherwise webhook reject
+	// request so if a user has installed prev version and has not enabled
+	// pruner then `keep` will have a value 1 and after upgrading
+	// to newer version webhook will fail if keep has a value and
+	// other fields are not defined
+	// this handles that case by removing the default for keep if
+	// other pruner fields are not defined
+	if len(tc.Spec.Pruner.Resources) == 0 {
+		tc.Spec.Pruner.Keep = nil
+		tc.Spec.Pruner.Schedule = ""
+	} else if tc.Spec.Pruner.Schedule == "" {
+		tc.Spec.Pruner.Keep = nil
+		tc.Spec.Pruner.Resources = []string{}
+	}
 }