use hdr_demo as binary name/dir

[ldemailly]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 22.22222% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.12%. Comparing base (41f7188) to head (27b3790).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
hdr.go	22.22%	2 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
- Coverage   41.64%   41.12%   -0.52%     
==========================================
  Files           2        2              
  Lines         353      355       +2     
==========================================
- Hits          147      146       -1     
- Misses        194      196       +2     
- Partials       12       13       +1     

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