[202211] build: add an env var to run make reset unattended #13821
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Why I did it
This is the backport to 202211 from master (see PR #12207)
When doing automated builds of SONiC images, we need to reset the working repositories between each build.
How I did it
Adding an environment variable that is read by Makefile.work
How to verify it
running
UNATTENDED=1 make reset
should make an automatic reset of all working directories
Which release branch to backport (provide reason below if selected)
Description for the changelog
add an environment variable to run "make reset" unattended
Ensure to add label/tag for the feature raised. example - PR#2174 where, Generic Config and Update feature has been labelled as GCU.
N/A
Link to config_db schema for YANG module changes
N/A
A picture of a cute animal (not mandatory but encouraged)