Add environment variables to kpack image CR

Author: kramerul

lib/cloud_controller/kpack/stager.rb

@@ -75,6 +75,11 @@ def image_resource(staging_details)
             blob: {
               url: blobstore_url_generator.package_download_url(staging_details.package),
             }
+          },
+          build: { 
+            env: staging_details.environment_variables.to_a.
+                  select{ | key, value | key =~ /^BP[A-Z]{0,1}_/ }.
+                  map{ | key , value |  {name: key, value: value.to_s() }  }
           }
         }
       })

spec/unit/lib/cloud_controller/kpack/stager_spec.rb

@@ -11,7 +11,7 @@ module Kpack
     )
     }
     let(:package) { VCAP::CloudController::PackageModel.make }
-    let(:environment_variables) { { 'nightshade_vegetable' => 'potato' } }
+    let(:environment_variables) { { 'BP_JAVA_VERSION' => '8.*', 'JAVA_OPTS' => 'invalid', 'BPL_HEAD_ROOM' => 0}  }
     let(:staging_memory_in_mb) { 1024 }
     let(:staging_disk_in_mb) { 1024 }
     let(:blobstore_url_generator) do
@@ -77,6 +77,9 @@ module Kpack
               blob: {
                 url: 'package-download-url',
               }
+            },
+            build: {
+              env: [ {name: "BP_JAVA_VERSION", value: "8.*"} , {name: "BPL_HEAD_ROOM", value: "0"}]
             }
           }
         }))
@@ -132,8 +135,7 @@ module Kpack
                 blob: {
                   url: 'old-package-url',
                 }
-              }
-            }
+              }            }
           })
         end