add CODEOWNERS to GH Actions

[ghost]

This means that if anybody other than the @klothoplatform/engineers team puts up a PR, a member of that team needs to authorize that PR's actions to run.

See: https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions

Standard checks

• Unit tests: none
• Docs: we don't have a contribution guide; when we do, we may want to note this there
• Backwards compatibility: no issues

[github-actions]

Package	Line Rate	Health
github.com/klothoplatform/klotho/pkg/analytics	2%	❌
github.com/klothoplatform/klotho/pkg/annotation	24%	❌
github.com/klothoplatform/klotho/pkg/core	21%	❌
github.com/klothoplatform/klotho/pkg/env_var	82%	✔
github.com/klothoplatform/klotho/pkg/exec_unit	41%	❌
github.com/klothoplatform/klotho/pkg/infra/kubernetes	58%	➖
github.com/klothoplatform/klotho/pkg/infra/kubernetes/helm	52%	➖
github.com/klothoplatform/klotho/pkg/input	63%	➖
github.com/klothoplatform/klotho/pkg/lang	37%	❌
github.com/klothoplatform/klotho/pkg/lang/dockerfile	0%	❌
github.com/klothoplatform/klotho/pkg/lang/golang	9%	❌
github.com/klothoplatform/klotho/pkg/lang/javascript	46%	❌
github.com/klothoplatform/klotho/pkg/lang/python	60%	➖
github.com/klothoplatform/klotho/pkg/lang/yaml	0%	❌
github.com/klothoplatform/klotho/pkg/logging	7%	❌
github.com/klothoplatform/klotho/pkg/multierr	95%	✔
github.com/klothoplatform/klotho/pkg/provider/aws	60%	➖
github.com/klothoplatform/klotho/pkg/runtime	75%	✔
github.com/klothoplatform/klotho/pkg/static_unit	32%	❌
github.com/klothoplatform/klotho/pkg/validation	73%	➖
Summary	42% (3586 / 8582)	❌