b87ec3c common: Add readonly sysroot migration unit and script

Authored and Committed by siosm 2 years ago
    common: Add readonly sysroot migration unit and script
    
    Add unit and corresponding script to migrate existing systems to read
    only sysroot.
    
    See: https://fedoraproject.org/wiki/Changes/Silverblue_Kinoite_readonly_sysroot
    RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=2060976
    
        
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