Adds the 'environment' Field to the PostgresCluster Spec

An 'environment' field is now available within the PostgresCluster spec,
which allows the user to specify the infrastructure and/or stage in
development the PostgresCluster is associated with.  Accepted values for
this field are 'production' and 'development'. 'production' is the default.

Additionally, a CEL validation rule has been added to the CRD that requires
backups to be configured for 'production' PostgresCluster's.  This change is
fully backward compatible and non-breaking with existing PostgresCluster
specs.

Issue: PGO-1645

Author: andrewlecuyer

config/crd/bases/postgres-operator.crunchydata.com_postgresclusters.yaml

@@ -7599,6 +7599,19 @@ spec:
                   scheduling constraints will be used in addition to any custom constraints
                   provided.
                 type: boolean
+              environment:
+                default: production
+                description: |-
+                  Environment allows PGO to adapt its behavior according to the specific infrastructure
+                  and/or stage of development the PostgresCluster is associated with.  This includes
+                  requiring and/or loosening the requirements for certain components and settings, while
+                  also providing deeper insights, events and status that more closely align with
+                  PostgresCluster's intended use.
+                  Defaults to “production”.  Acceptable values are "development" and "production".
+                enum:
+                - production
+                - development
+                type: string
               image:
                 description: |-
                   The image name to use for PostgreSQL containers. When omitted, the value
@@ -16874,6 +16887,10 @@ spec:
             - instances
             - postgresVersion
             type: object
+            x-kubernetes-validations:
+            - message: Backups must be enabled for production PostgresCluster's.
+              rule: '(self.environment == ''production'') ? self.backups.pgbackrest
+                != null : true'
           status:
             description: PostgresClusterStatus defines the observed state of PostgresCluster
             properties:

pkg/apis/postgres-operator.crunchydata.com/v1beta1/postgrescluster_test.go

@@ -43,6 +43,7 @@ spec:
     pgbackrest:
       repos: null
   config: {}
+  environment: production
   instances: null
   patroni:
     leaderLeaseDurationSeconds: 30
@@ -76,6 +77,7 @@ spec:
     pgbackrest:
       repos: null
   config: {}
+  environment: production
   instances:
   - dataVolumeClaimSpec:
       resources: {}

pkg/apis/postgres-operator.crunchydata.com/v1beta1/postgrescluster_types.go

@@ -13,6 +13,7 @@ import (
 )
 
 // PostgresClusterSpec defines the desired state of PostgresCluster
+// +kubebuilder:validation:XValidation:rule="(self.environment == 'production') ? self.backups.pgbackrest != null : true", message="Backups must be enabled for production PostgresCluster's."
 type PostgresClusterSpec struct {
 	// +optional
 	Metadata *Metadata `json:"metadata,omitempty"`
@@ -58,6 +59,17 @@ type PostgresClusterSpec struct {
 	// +optional
 	DisableDefaultPodScheduling *bool `json:"disableDefaultPodScheduling,omitempty"`
 
+	// Environment allows PGO to adapt its behavior according to the specific infrastructure
+	// and/or stage of development the PostgresCluster is associated with.  This includes
+	// requiring and/or loosening the requirements for certain components and settings, while
+	// also providing deeper insights, events and status that more closely align with
+	// PostgresCluster's intended use.
+	// Defaults to “production”.  Acceptable values are "development" and "production".
+	// +kubebuilder:validation:Enum={production,development}
+	// +kubebuilder:default=production
+	// +optional
+	Environment *string `json:"environment,omitempty"`
+
 	// The image name to use for PostgreSQL containers. When omitted, the value
 	// comes from an operator environment variable. For standard PostgreSQL images,
 	// the format is RELATED_IMAGE_POSTGRES_{postgresVersion},
@@ -305,6 +317,11 @@ func (s *PostgresClusterSpec) Default() {
 	if s.UserInterface != nil {
 		s.UserInterface.Default()
 	}
+
+	if s.Environment == nil {
+		s.Environment = new(string)
+		*s.Environment = "production"
+	}
 }
 
 // Backups defines a PostgreSQL archive configuration