fix(ci): don't overwrite the build console with the runtime one

On parallel builds both will appear one after the other. But on serial
builds the append flag was missed, causing in the loss of the console.
Add it to also have both.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I6bbfd168d04dcc282b043c14e5eb5d55bb934b00
1 file changed