Add dockerfile for flatpak nightly build

Change-Id: I910e402a4f3cb5e7d03b609ff773a1fabeeabed9
Signed-off-by: Mat Booth <mat.booth@gmail.com>
Reviewed-on: https://git.eclipse.org/r/c/linuxtools/org.eclipse.linuxtools.eclipse-build/+/178752
Tested-by: Mat Booth <mat.booth@redhat.com>
Reviewed-by: Mat Booth <mat.booth@redhat.com>
2 files changed