Change default CLI upload type to hashedrekord

[Hayden-IO]

Summary

This change sets the default --type flag to hashedrekord in rekor-cli, along with changing the default --pki-format flag to x509 (which is certificates and public keys).

This is done in a backwards compatible way, in that a client can continue to pass an artifact via --artifact and it will automatically be hashed if the type is hashedrekord.

While the PKI flag change is a breaking change, I doubt anyone was using pgp, which was the default.

Release Note

Documentation

[Hayden-IO]

Verify this works with:

openssl genrsa -out private.pem 4096
openssl rsa -in private.pem -pubout -out public.pem
echo "hello world" > artifact.txt
openssl dgst -sha256 -sign private.pem -out signature.sig artifact.txt
rekor-cli upload --artifact artifact.txt --signature signature.sig --public-key public.pem

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 18.79%. Comparing base (488eb97) to head (d0b22d4).
⚠️ Report is 725 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/rekor-cli/app/pflag_groups.go	63.15%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2885       +/-   ##
===========================================
- Coverage   66.46%   18.79%   -47.67%     
===========================================
  Files          92      191       +99     
  Lines        9258    20344    +11086     
===========================================
- Hits         6153     3824     -2329     
- Misses       2359    16013    +13654     
+ Partials      746      507      -239     

Flag	Coverage Δ
e2etests	?
unittests	18.79% <66.66%> (-28.89%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.