adds support gor build arguments

vars/functions.groovy

@@ -53,7 +53,7 @@ def deletePod (Map config) {
     }
 }
 
-def buildContainer (Map config) {
+def buildContainer (Map config, []String buildArg = []) {
     def ws = pwd()
     stage ("Build Container") {
         container ("kaniko") {
@@ -64,11 +64,16 @@ def buildContainer (Map config) {
             )]) {
                 sh "set +x; printf '{\"auths\":{\"%s\":{\"auth\": \"%s\"}}}' \"${config.repository}\" \"${dcreds.bytes.encodeBase64().toString()}\" > /kaniko/.docker/config.json"
             }
+            def buildArguments = ""
+            for (i in buildArg) {
+                buildArguments += " --build-arg ${i}"
+            }
             sh """
                 /kaniko/executor \\
                     --context "${ws}" \\
                     -f "${ws}/Dockerfile" \\
-                    --destination "${config.imageDest}"
+                    --destination "${config.imageDest}" \\
+                    ${buildArguments}
             """
         }
     }