Fix webdesktop container build segmentation fault with enhanced musl dependencies, add PR testing workflow, and preserve challenge functionality

Co-authored-by: commjoen <[email protected]>

Author: Copilot

.gitignore

@@ -121,3 +121,4 @@ scripts/sort_contibutors/contributors_file.*
 git_secrets_output.txt
 .secrets.baseline.json
 lychee
+sed*