Change build criteria for push - ignore .md -files

Build not only on master pushes, but all pushes but do ignore
documentation only changes.

.github/workflows/devmode-test-build.yml

@@ -2,7 +2,8 @@ name: production build
 
 on:
   push:
-    branches: [ "master" ]
+    paths-ignore:
+      - '**/*.md'
   pull_request:
     branches: [ "master" ]
   workflow_dispatch: