chore: apply license headers

[mrjoelkamp]

summary

• applies license headers
• adds header templates

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.37%. Comparing base (79bbc9b) to head (01a6a2a).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #204      +/-   ##
==========================================
- Coverage   70.75%   66.37%   -4.38%     
==========================================
  Files          44       44              
  Lines        2595     3215     +620     
==========================================
+ Hits         1836     2134     +298     
- Misses        457      779     +322     
  Partials      302      302              

Flag	Coverage Δ
unittests	66.37% <ø> (-4.38%)	⬇️

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[jonnystoten]

Looks like we need to outdent all of the comments in Go files to make the linter happy 😅

How do the templates work?

Do we need to include the year in the copyright notice in each file? Do we need to update them every year?

[mrjoelkamp]

Looks like we need to outdent all of the comments in Go files to make the linter happy 😅

I was questioning this, I went with the template that was used in containerd per @thaJeztah's suggestion in the ticket we created.

I was planing on just ignoring the linter for these.

How do the templates work?

See https://github.com/containerd/ltag

Do we need to include the year in the copyright notice in each file? Do we need to update them every year?

Per suggestion and the ticket description, we only need to update copyright when we modify the file with the copyright notice in it.

I just re-read it and it seems the year is optional, so maybe we should just remove the year entirely?

[thaJeztah]

FWIW, the ltag package works, but I've seen maintenance falling behind (still looking if possibly it should be transferred to (e.g.) the containerd org.

An alternative is a package provided by Google to do the same; I know we use that in this repository; PR below may help with the implementation;

• Add license headers cli-docs-tool#2

[mrjoelkamp]

I just re-read it and it seems the year is optional, so maybe we should just remove the year entirely?

removed year