git: openjdk/jfx: jfx16: 8259639: GitHub actions: build fails on Linux due to missing apt-get update

[Kevin Rushforth]

Changeset: 9dd2058f
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2021-01-12 18:12:42 +0000
URL:       https://git.openjdk.java.net/jfx/commit/9dd2058f

8259639: GitHub actions: build fails on Linux due to missing apt-get update

Reviewed-by: arapte, pbansal

! .github/workflows/submit.yml