Backport of add missing license file into release/1.4.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #3921 to be assessed for backporting due to the inclusion of the label backport/1.4.x.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@wangxinyi7
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: unable to process merge commit: "6e23ef26d107edf167c552baf47146a741314655", automatic backport requires rebase workflow

The below text is copied from the body of the original PR.

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DoD

• Add license file into ZIP
• Add license file into linux config_dir
• Add license file into docker image
• Add license label into docker image

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Overview of commits

• 25f85af - 98a867e - 6e23ef2 - 557e7f8