change file_name_template to PackageName

[strongjz]

Signed-off-by: James Strong strong.james.e@gmail.com

Summary

Change NFPM artifacts names to match package_name

Ticket Link

Fixes #1643

Release Note

Update Change NFPM artifacts names to match package_name, ie `cosign` and not `cosign-linux-amd64`

[codecov-commenter]

Codecov Report

Merging #1683 (f3000c9) into main (2fcf30e) will increase coverage by 1.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1683      +/-   ##
==========================================
+ Coverage   27.97%   29.25%   +1.27%     
==========================================
  Files         137      140       +3     
  Lines        7820     8370     +550     
==========================================
+ Hits         2188     2449     +261     
- Misses       5403     5654     +251     
- Partials      229      267      +38     

Impacted Files	Coverage Δ
pkg/cosign/kubernetes/webhook/validator.go	81.75% <0.00%> (-1.80%)	⬇️
cmd/cosign/cli/verify/verify_blob.go	10.63% <0.00%> (-1.36%)	⬇️
pkg/apis/config/image_policies.go	69.38% <0.00%> (-1.35%)	⬇️
pkg/cosign/tuf/client.go	62.34% <0.00%> (-0.95%)	⬇️
pkg/cosign/fetch.go	0.00% <0.00%> (ø)
pkg/cosign/common.go	0.00% <0.00%> (ø)
cmd/cosign/cli/sign.go	0.00% <0.00%> (ø)
cmd/cosign/cli/clean.go	0.00% <0.00%> (ø)
cmd/cosign/cli/attest.go	0.00% <0.00%> (ø)
cmd/cosign/cli/verify.go	0.00% <0.00%> (ø)
... and 18 more

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