allow non-leo files to be in src folder #28322
Merged
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Motivation
I use macOS X, and when I try to copy a file from inside the 'src' folder or simply visit the folder, macOS X creates '.DS_Store' files. When those files are created, Leo suddenly stops building. This is confusing for both newcomers and experienced programmers (it happened to me when my project suddenly stopped building for no apparent reason; the reason was macOS X creating a '.DS_Store' file inside the 'src' folder).
Test Plan
put any non leo file inside the src folder.