Feature: Support for `TC_INITSCRIPT` parameter

[ferdinand-swoboda]

Hey, thanks for this plugin, it's a neat quality of life & code improvement!

While trying to bring this goodie to an internal project I noticed that the JDBC connection parameter TC_INITSCRIPT (and TC_INITFUNCTION) are not mentioned / covered by the configuration options.
I'm specifically referring to the case when one does not wish to connect to a pre-existing container and thus does not provide a <jooq><jdbc>...</jdbc></jooq> block.

Did I simply miss this in the documentation?
If not, could this be supported with relative ease?

Possibly naively speaking, I would add this as a nested configuration option e.g.

<database>
    <type>POSTGRES</type>
    <init_script>/../../docker/postgres/01_site.sql</init_script>
</database>

Happy to look into creating a PR

[romchellis]

Please feel free for pull request

[ferdinand-swoboda]

My use case turned out to be covered by the existing DB user credentials options.
I think it's better to wait for more interest in this feature before increasing the API surface.
Up to you wether you want to leave the issue open for that purpose.

[zzzLobster]

@eddumelendez

Currently, the suggested approach is using copy files instead due to most of the images provides a fresh initialization folder.

Could you please clarify what 'copy file' means?
Is it about using 'Initialization scripts' of a DB container?
Like this for PG:

If you would like to do additional initialization in an image derived from this one, add one or more *.sql, *.sql.gz, or *.sh scripts under /docker-entrypoint-initdb.d (creating the directory if necessary).

MySQL and MariaDB:

Furthermore, it will execute files with extensions .sh, .sql and .sql.gz that are found in /docker-entrypoint-initdb.d

If I understand the proposal correctly, the plugin should accept list of files and copy them into the init folder of the container.
Is that correct assumption?

Config could look like

        <copy>
          <entries>
            <entry>
              <sourceFile>filesystem:${project.basedir}/src/test/resources/db/init.sql</sourceFile>
              <containerPath>/docker-entrypoint-initdb.d/</containerPath>
            </entry>
            <entry>
              <sourceFile>classpath:db/postgres/init.sh</sourceFile>
              <containerPath>/docker-entrypoint-initdb.d/123.sh</containerPath>
            </entry>
          </entries>
        </copy>

Current approach in the PR just mimics initScript mechanism built into JdbcDatabaseContainer of Testcontainers.

[kiview]

@eddumelendez was referring to using the Copy API. I think your config proposal makes sense @zzzLobster 👍