fix: attempt to configure separate pipelines for prs and pushes to main

Atm. two builds are created which lead to the missing recognition of the success of one of the builds.

.drone.yml

@@ -1,7 +1,7 @@
 ---
 kind: pipeline
 type: docker
-name: build_webseite
+name: build_webseite_main
 
 workspace:
   path: /workspace
@@ -11,4 +11,29 @@ steps:
     image: registry.wtf-eg.net/lektor
 
 image_pull_secrets:
-  - dockerconfig
+  - dockerconfig
+
+trigger:
+    branch:
+    - main
+    event:
+    - push
+
+---
+kind: pipeline
+type: docker
+name: build_webseite_pr
+
+workspace:
+  path: /workspace
+
+steps:
+  - name: build
+    image: registry.wtf-eg.net/lektor
+
+image_pull_secrets:
+  - dockerconfig
+
+trigger:
+    event:
+    - pull_request