don't be too hard to 9.5

pkg/apis/acid.zalan.do/v1/crds.go

@@ -504,6 +504,9 @@ var PostgresCRDResourceValidation = apiextv1.CustomResourceValidation{
 							"version": {
 								Type: "string",
 								Enum: []apiextv1.JSON{
+									{
+										Raw: []byte(`"9.5"`),
+									},
 									{
 										Raw: []byte(`"9.6"`),
 									},

pkg/cluster/majorversionupgrade.go

@@ -9,6 +9,7 @@ import (
 
 // VersionMap Map of version numbers
 var VersionMap = map[string]int{
+	"9.5": 90500,
 	"9.6": 90600,
 	"10":  100000,
 	"11":  110000,
@@ -33,7 +34,7 @@ func (c *Cluster) GetDesiredMajorVersionAsInt() int {
 func (c *Cluster) GetDesiredMajorVersion() string {
 
 	if c.Config.OpConfig.MajorVersionUpgradeMode == "full" {
-		// current is 9.6, minimal is 11 allowing 11 to 14 clusters, everything below is upgraded
+		// e.g. current is 9.6, minimal is 11 allowing 11 to 14 clusters, everything below is upgraded
 		if IsBiggerPostgresVersion(c.Spec.PgVersion, c.Config.OpConfig.MinimalMajorVersion) {
 			c.logger.Infof("overwriting configured major version %s to %s", c.Spec.PgVersion, c.Config.OpConfig.TargetMajorVersion)
 			return c.Config.OpConfig.TargetMajorVersion