ci: add jenkinsfile

Jenkinsfile

@@ -0,0 +1,37 @@
+pipeline {
+    agent any
+
+    options {
+        buildDiscarder {
+            logRotator(numToKeepStr: '5')
+        }
+    }
+
+    stage("Build") {
+        agent {
+            label "flutter"
+        }
+
+        steps {
+            sh '''
+            #!/bin/bash
+
+            flutter pub get
+
+            flutter build web
+
+            cd build/web
+            tar -cvf ../../web.tgz .
+
+            '''
+        }
+
+        post {
+            always {
+                archiveArtifacts artifacts: "web.tgz"
+
+                cleanWs()
+            }
+        }
+    }
+}