allow uid and gid to specified on the build command line #50
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The default mysql uid and gid may conflict with other users on the same host.
Currently, Docker does not allow ownership of files on mounted volumes to be changed.
For hosts that employ mounted volumes, the best way to avoid a uid conflict is to inject a unique id for use when the user is initially created. (other options are to map uids on the host using nfs (limiting) or bindfs (slow perfomance).
This pull request simply adds ARGs to each of the 3 Dockerfiles, allowing the desired uid and gid to specified at build time. If the build-arg is not specified, uid and gid default back to the currently generated value, 999.
Usage Example: