Make tzinfo opt-in.

[klausenbusk]

Not sure if it should be opt-in or opt-out, also a little unsure about the env name MYSQL_LOAD_TIME_ZONE_TABLES. I think it should be opt-in.
#24 depends on this.

[md5]

Seems like this needs to be an opt-out to avoid breaking existing users who are now relying on the DB having the time zones loaded. I know I personally ran into this with the mysql image one some point. I didn't find any user reports that motivated docker-library/mysql#80, but I seem to recall that there were some.

[klausenbusk]

How do this look?

[md5]

LGTM. Let's see what the maintainers have to say.

[klausenbusk]

Any update?

[klausenbusk]

Update?

[yosifkit]

LGTM

[tianon]

I like the feature, but I'm not so sure about the name. 😕

I'm thinking maybe something slightly more descriptive of exactly what's being skipped, like MYSQL_INITDB_SKIP_TZINFO. WDYT?

[klausenbusk]

but I'm not so sure about the name.

Me either.

I'm thinking maybe something slightly more descriptive of exactly what's being skipped, like MYSQL_INITDB_SKIP_TZINFO. WDYT?

Look fine to me, I can update the PR now, if it okay?

[tianon]

Yeah, sounds good enough; thanks for bearing with us. 👍

[klausenbusk]

Done, also not sure about the commit message. Maybe it fine.

[tianon]

¯\_(ツ)_/¯

LGTM

[yosifkit]

Commit message seems fine.