Option to run init db scripts every time

[AlexNik]

Changelog category (leave one):

• Build/Testing/Packaging Improvement

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

If you want to run initdb scripts every time when ClickHouse container is starting you shoud initialize environment varible CLICKHOUSE_ALWAYS_RUN_INITDB_SCRIPTS.

Documentation entry for user-facing changes

Add env variable CLICKHOUSE_ALWAYS_RUN_INITDB_SCRIPTS.

[robot-ch-test-poll1]

This is an automated comment for commit 68df201 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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Check name	Description	Status
AST fuzzer	Runs randomly generated queries to catch program errors. The build type is optionally given in parenthesis. If it fails, ask a maintainer for help	❌ failure
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[AlexNik]

Improvement of #50724

[AlexNik]

@Felixoid Could you review?

[Felixoid]

Yes, looks good.