fix(ci): move docker build to post stage

Jenkinsfile

@@ -6,20 +6,17 @@ pipeline {
                 sh 'cargo build'
             }
         }
-	stage('docker') {
-	    steps {
-		echo 'Starting docker image build'
-
-		script {
-		    docker.build("northcode/telegram-leetbot")
-		}
-	    }
-	}
     }
 
     post {
 	success {
 	    archiveArtifacts artifacts: 'target/debug/telegram-leetbot', fingerprint: true
+
+	    echo 'Starting docker image build'
+
+	    script {
+		docker.build("northcode/telegram-leetbot")
+	    }
 	}
     }
 }