feat(ci): build tfa and tftf in the job's workspace directory

This is useful when running locally - avoid polluting the source
directory with artefacts and allows more than 1 job to be built at the
same time.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I8e8e0ff4741d5454706fd96a55936d56c3a6d22e
22 files changed