Fix build pipline to run on every push

Author: lukasmasuch

.github/workflows/build-pipeline.yml

@@ -9,7 +9,7 @@ on:
       working_directory:
         description: "Working directory from where the build command is run"
         required: false
-    push:
+  push:
 
 env:
   BUILD_ARGS: ${{ secrets.BUILD_ARGS }}