jenkins: add android building

Jenkinsfile

@@ -8,17 +8,29 @@ pipeline {
         cron('H/10 * * * *')
     }
     stages {
-        stage('Build Flutter') {
+        stage('Android') {
+            stages {
+                stage('Build') {
+                    steps {
+                        sh 'devenv shell flutter build apk'
+                    }
+                }
+                stage('Deploy') {
+                    steps {
+                        sh 'return 1'
+                    }
+                }
+            }
+        }
+        stage('Web') {
+            stages {
+                stage('Build') {
                     steps {
                         sh 'devenv shell flutter build web --release'
-            }
-        }
-        stage('Build Docker') {
-            steps {
                         sh 'docker build -t harbor.julian-mutter.de/sheetless/sheetless-frontend .'
                     }
                 }
-        stage('Deploy Docker') {
+                stage('Deploy') {
                     steps {
                         withDockerRegistry([credentialsId: 'harbor-login-julian', url: 'https://harbor.julian-mutter.de']) {
                             sh 'docker push harbor.julian-mutter.de/sheetless/sheetless-frontend'
@@ -27,3 +39,5 @@ pipeline {
                 }
             }
         }
+    }
+}