Add license headers

[kim-tsao]

Signed-off-by: Kim Tsao ktsao@redhat.com

What does this PR do?:

Adds missing license headers and performs a check for missings licenses in PR workflow

Which issue(s) this PR fixes:

devfile/api#931

PR acceptance criteria:

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened.

• Open new test/doc issues under the devfile/api repo
• Check each criteria if:
• There is a separate tracking issue. Add the issue link under the criteria
  or
• test/doc updates are made as part of this PR
• If unchecked, explain why it's not needed

• Unit/Functional tests

• QE Integration test

• Documentation

• Client Impact

How to test changes / Special notes to the reviewer:

[codecov-commenter]

Codecov Report

Base: 57.67% // Head: 57.67% // No change to project coverage 👍

Coverage data is based on head (27079f4) compared to base (a798214).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #145   +/-   ##
=======================================
  Coverage   57.67%   57.67%           
=======================================
  Files          35       35           
  Lines        3794     3794           
=======================================
  Hits         2188     2188           
  Misses       1485     1485           
  Partials      121      121           

Impacted Files	Coverage Δ
pkg/devfile/generator/generators.go	64.52% <ø> (ø)
pkg/devfile/generator/utils.go	92.20% <ø> (ø)
pkg/devfile/parse.go	26.78% <ø> (ø)
pkg/devfile/parser/configurables.go	0.00% <ø> (ø)
pkg/devfile/parser/context/apiVersion.go	83.33% <ø> (ø)
pkg/devfile/parser/context/content.go	84.09% <ø> (ø)
pkg/devfile/parser/context/context.go	23.28% <ø> (ø)
pkg/devfile/parser/context/fakecontext.go	0.00% <ø> (ø)
pkg/devfile/parser/context/fs.go	100.00% <ø> (ø)
pkg/devfile/parser/context/schema.go	78.57% <ø> (ø)
... and 24 more

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kim-tsao, maysunfaisal

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• OWNERS [kim-tsao,maysunfaisal]

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