Initialization of the database only once in Docker.

[AlexNik]

Changelog category:

• Build/Testing/Packaging Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

If the database is already initialized, it doesn't need to be initialized again upon subsequent launches. This can potentially fix the issue of infinite container restarts when the database fails to load within 1000 attempts (relevant for very large databases and multi-node setups).

[CLAassistant]

All committers have signed the CLA.

[den-crane]

wdyt @Felixoid

[robot-ch-test-poll]

This is an automated comment for commit 3ed7cff with description of existing statuses. It's updated for the latest CI running

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Check name	Description	Status
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[Felixoid]

It makes sense to implement it similarly to mysql and postgresql images, so it requires some refactoring to make it nices

[AlexNik]

@Felixoid is it OK now?
I'va added DATABASE_ALREADY_EXISTS variable and shift for if body.

[Felixoid]

looks OK to me, asking for another pair of eyes though

[qoega]

BTW do we have at least some trivial tests that use this docker images? Maybe it is time to add some...

[Felixoid]

1 time-out test for the debug build looks ok, it succeeded everywhere else

[Alesh]

Couldn't you have left the previous option for developer mode? It was convenient to immediately add the creation of new entities to the initialization script. Now we have to come up with workarounds.

[vincentbernat]

This change is inconvenient if we still need to add some init steps even if the database exists. I am using it to:

• update ClickHouse configuration
• install Protobuf schemas

[alexey-milovidov]

Ok, looking forward to another PR with improvement.