Make kubernetes API URL optional

[micahhausler]

Description

• Add default container image tag

Signed-off-by: Micah Hausler [email protected]

Why is this needed

• setting --kubernetes without --kubeconfig is required for in-cluster clients, and setting only a --kubeconfig is also valid.
• make image should produce an image with a tag without having to specify any arguments

How are existing users impacted? What migration steps/scripts do we need?

N/A

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Merging #103 (860da1f) into main (17530ef) will decrease coverage by 2.77%.
The diff coverage is 0.00%.

❗ Current head 860da1f differs from pull request most recent head 9862949. Consider uploading reports for the commit 9862949 to get more accurate results

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   42.53%   39.75%   -2.78%     
==========================================
  Files           8        8              
  Lines         583      581       -2     
==========================================
- Hits          248      231      -17     
- Misses        304      317      +13     
- Partials       31       33       +2     

Impacted Files	Coverage Δ
hardware/client.go	0.00% <0.00%> (ø)
grpc/server.go	43.67% <0.00%> (-10.76%)	⬇️

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[chrisdoherty4]

lgtm