jenkins: attempt to fix Jenkinsfile again

Jenkinsfile

@@ -1,19 +1,22 @@
 pipeline {
     agent none
     stages {
-        stage('Main') {
+        stage('Checkout') {
             when {
                 beforeAgent true
                 branch 'main'
             }
             agent { label 'agent-12' }
-            stages {
-                stage('Checkout') {
             steps {
                 checkout scm
             }
         }
         stage('Build') {
+            when {
+                beforeAgent true
+                branch 'main'
+            }
+            agent { label 'agent-12' }
             steps {
                 script {
                     docker.build('trianta.dev:latest')
@@ -21,25 +24,32 @@ pipeline {
             }
         }
         stage('Deploy') {
+            when {
+                beforeAgent true
+                branch 'main'
+            }
+            agent { label 'agent-12' }
             steps {
                 sh 'docker stop trianta.dev && docker rm trianta.dev || exit 0'
                 sh 'docker run -d -e USER=scv -e USER_UID=1001-e USER_GID=1001 --restart=unless-stopped -p 3466:80 --name trianta.dev trianta.dev:latest'
             }
         }
-            }
+        stage('Test Checkout') {
-        }
-        stage('Testing') {
             when {
                 beforeAgent true
                 not { branch 'main' }
             }
             agent { label 'agent-13' }
-            stage('Test Checkout') {
             steps {
                 checkout scm
             }
         }
         stage('Test Build') {
+            when {
+                beforeAgent true
+                not { branch 'main' }
+            }
+            agent { label 'agent-13' }
             steps {
                 script {
                     docker.build('test.trianta.dev:latest')
@@ -47,11 +57,15 @@ pipeline {
             }
         }
         stage('Test Deploy') {
+            when {
+                beforeAgent true
+                not { branch 'main' }
+            }
+            agent { label 'agent-13' }
             steps {
                 sh 'docker stop test.trianta.dev && docker rm test.trianta.dev || exit 0'
                 sh 'docker run -d -e USER=scv -e USER_UID=1001-e USER_GID=1001 --restart=unless-stopped -p 3466:80 --name test.trianta.dev test.trianta.dev:latest'
             }
         }
     }
-    }
 }