feat(ci): publish docker image as part of build

Jenkinsfile

@@ -19,7 +19,10 @@ pipeline {
 
 		echo 'Starting docker image build'
 		script {
-		    docker.build("northcode/telegram-leetbot")
+		    docker.withRegistry("pkg.northcode.no") {
+			    def image = docker.build("pkg.northcode.no/telegram-leetbot")
+			    image.push()
+	   	    }
 		}
 	    }
 	}