[RFC V3] Create supported branch from edk2-stable* tag (Required to address critical bug BZ3111)

["Michael D Kinney" <michael.d.kinney@intel.com>]

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Hello,



The following bug has been fixed on edk2/master



    https://bugzilla.tianocore.org/show_bug.cgi?id=3111

    https://github.com/tianocore/edk2/pull/1226



This bug is also considered a critical bug against edk2-stable202011.  The behavior

of the Variable Lock Protocol was changed in a non-backwards compatible manner in

edk2-stable202011 and this is impacting some downstream platforms.  The following

2 commits on edk2/master restore the original behavior of the Variable Lock Protocol.



    https://github.com/tianocore/edk2/pull/1226/commits/893cfe2847b83da74f53858d6acaa15a348bad7c

    https://github.com/tianocore/edk2/pull/1226/commits/16491ba6a6e9a91cedeeed45bc0fbdfde49f7968



The request here is to create a supported branch from edk2-stable202011 tag and apply

these 2 commits as critical bug fixes on the supported branch.



Since we started using the edk2-stable* tag process, there has not been a request to create

a supported branch from one of those tags.  As a result, there are a couple opens that

need to be addressed:



1) Supported branch naming convention.



    Branch Proposal: stable/<YYYY><MM>

    Branch Example:  stable/202011



2) CI requirements for supported branches.



    Proposal: Update .azurepipelines yml files to trigger on stable/* branches,

    update .mergify configuration file to support merging of stable/* branches,

    and update GitHub branch protection settings to protect stable/* branches.



3) A stable/* branch is only supported until the next edk2-stable tag release.



4) Release requirements for supported branches.



   Proposal: If there are a significant number of critical fixes applied to

   a stable/* branch, then a request for a release can be made that would

   trigger focused testing of the supported branch and creation of a new

   release.  If all testing passes, then a tag is created on the stable/*

   branch and a release is created on GitHub that summarizes the set of

   critical fixes and the testing performed.



   Tag Proposal: edk2-stable<YYYY><MM>.<XX>

   Tag Example : edk2-stable202011.01



Please let me know if you have any feedback or comments on this proposal.  The goal

is to close on this topic this week.



Thank you,



Mike


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