RFR: 7449: Add GitHub action to verify copyright year

[Jean-Philippe Bempel]

On Sun, 5 Dec 2021 19:33:50 GMT, Alex Ciminian <duke at openjdk.java.net> wrote:

>   * if the file is new, it should have Oracle and Datadog copyright starting from the year of the HEAD commit

It's not only Datadog for new file can be just Oracle, but also Red Hat, Azul, ... :)

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PR: https://git.openjdk.java.net/jmc/pull/342