Optimize PR builds by excluding ARM and macOS architectures (#1)

Merging PR build optimization

Author: bjoernbethge

.github/workflows/MainDistributionPipeline.yml

@@ -16,7 +16,7 @@ jobs:
       duckdb_version: v1.4.3
       ci_tools_version: v1.4.3
       extension_name: radio
-      exclude_archs: wasm_mvp;wasm_eh;wasm_threads;windows_amd64_rtools;windows_amd64_mingw
+      exclude_archs: ${{ github.event_name == 'pull_request' && 'wasm_mvp;wasm_eh;wasm_threads;windows_amd64_rtools;windows_amd64_mingw;linux_arm64;osx_amd64;osx_arm64' || 'wasm_mvp;wasm_eh;wasm_threads;windows_amd64_rtools;windows_amd64_mingw' }}
     secrets:
       VCPKG_CACHING_AWS_ACCESS_KEY_ID: ${{ secrets.VCPKG_CACHING_AWS_ACCESS_KEY_ID
         }}