feat(cnbbuild) use commitid fom cpe as tag if artifact version is not available (#3659)

Co-authored-by: Ralf Pannemans <ralf.pannemans@sap.com>
Co-authored-by: Sumit Kulhadia <sumit.kulhadia@sap.com>

cmd/cnbBuild_generated.go

@@ -211,6 +211,11 @@ func cnbBuildMetadata() config.StepData {
 								Name:  "commonPipelineEnvironment",
 								Param: "artifactVersion",
 							},
+
+							{
+								Name:  "commonPipelineEnvironment",
+								Param: "git/commitId",
+							},
 						},
 						Scope:     []string{"GENERAL", "PARAMETERS", "STAGES", "STEPS"},
 						Type:      "string",

resources/metadata/cnbBuild.yaml

@@ -65,6 +65,8 @@ spec:
         resourceRef:
           - name: commonPipelineEnvironment
             param: artifactVersion
+          - name: commonPipelineEnvironment
+            param: git/commitId
       - name: containerRegistryUrl
         aliases:
           - name: dockerRegistryUrl