feature: private_key flag for private-builds
Note: Adds support of --private/-P
flag for OE/bake builds only in case of single/plan builds as cuurently only tuxapi(oebuilds endpoint) and tuxoe-backend has support for handling this key.
Support for tuxapi/tuxbuild-backend will be added later when they will be able to handle this flag.
Signed-off-by: alok alok.ranjan@linaro.org
Edited by Alok Ranjan