- docker/build-push-action to v4
- Drop `platforms` from `docker/setup-qemu-action` step, as this is
the default.
Signed-off-by: Hidde Beydals <hidde@hhh.computer>
As the `github.event.repository.name` property is not always available,
for example when the action gets triggered by a cron job.
Signed-off-by: Hidde Beydals <hello@hidde.co>