Dockerfile: fix filenames of artifacts

[thaJeztah]

No description provided.

[thaJeztah]

@milosgajdos @corhere @squizzi ptal 🤗

[corhere]

Obviously it's a tarball of a tarball, gzipped /s 😁

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.05 ⚠️

Comparison is base (f55a655) 56.92% compared to head (435c7b9) 56.88%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3910      +/-   ##
==========================================
- Coverage   56.92%   56.88%   -0.05%     
==========================================
  Files         106      106              
  Lines       10703    10703              
==========================================
- Hits         6093     6088       -5     
- Misses       3938     3942       +4     
- Partials      672      673       +1     

see 1 file with indirect coverage changes

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[thaJeztah]

Yeah, I highly suspect this was a copy/pasta from a release-pipeline of another repo that chose to use .tgz instead of .tar.gz. Either one is fine, but not "both" 😂

[thaJeztah]

But the unfortunate (or perhaps fortunate) result was that the release uploaded only the .sha256 checksums, and not the actual binaries;