Fix relative path resolution in "mix release" for symlinked scripts #13796
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This PR addresses an issue (#13672) with path resolution in
mix release
when scripts are executed via relative symlinks.The original script did not correctly resolve paths, leading to errors when the release script was invoked through a symlink that pointed to a relative path.
The fix ensures that SELF is always resolved to an absolute path, regardless of how the script is invoked.
This update improves the reliability of release scripts in environments where symlinks are used. Additionally, tests have been added to verify that both absolute and relative symlinks work correctly with the updated path resolution logic.