Change build workflows to manual-only triggers

Remove automatic push triggers from Windows and Linux build workflows.
Now they only run when manually dispatched via GitHub Actions UI.

This prevents unintended builds on every commit and gives full control
over when builds are triggered for testing and releases.

Author: pedgarcia

.github/workflows/build-linux.yml

@@ -8,12 +8,6 @@ on:
         required: true
         default: 'v1.0.0'
         type: string
-  push:
-    branches: [ main ]
-    paths-ignore:
-      - 'README.md'
-      - 'docs/**'
-      - '.gitignore'
 
 jobs:
   build-linux:

.github/workflows/build-windows.yml

@@ -8,12 +8,6 @@ on:
         required: true
         default: 'v1.0.0'
         type: string
-  push:
-    branches: [ main ]
-    paths-ignore:
-      - 'README.md'
-      - 'docs/**'
-      - '.gitignore'
 
 jobs:
   build-windows: