git: openjdk/jdk18u: master: 8282225: GHA: Allow one concurrent run per PR only

[Aleksey Shipilev]

Changeset: 92d2de6e
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2022-03-15 18:15:44 +0000
URL:       https://git.openjdk.java.net/jdk18u/commit/92d2de6e95d0e2f264892eef0b5caa6608f3bb5a

8282225: GHA: Allow one concurrent run per PR only

Backport-of: aaab2cb41666af8520fd01de70e2c4f9c87ef5fd

! .github/workflows/submit.yml