feature: updated scripts, Jenkinsfile. added install.sh

src/main/groovy/util/DockerBuildCommandFactory.groovy

@@ -9,7 +9,7 @@ class DockerBuildCommandFactory {
         def propertyNames = [
             "docker.build.${dockerfileName.toLowerCase()}.additional-args",
             "docker.build.additional-args"
-        ]
+        ].map { it.toString() }
 
         return propertyNames.stream()
             .map { CIProperties.findProperty(it).orNull() }