[docker] Fix mysql volume usage for new multi-process containers #2768
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The Ubuntu upgrade (or changes to MySQL after the update was initially
tested) broke the usage of mounting a directory as the MySQL data volume
for the multi-process image.
Why
--admin-auth-plugin=mysql_native_password
was needed (or I thoughtit was needed) is beyond me now. Passing the
mysqld
process the--init-file
option which creates our database user seems to work inall use cases.
#2745
#2757