Other dbs

[xihh87]

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• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

I allowed the variable CMD_DB_DIALECT to be used to setup the CMD_URL_DB in the hedgedoc service definition.

Benefits of this PR and context:

The only way to customize the DB connection without leaking the database information in a compose file is to set up the variables: FILE__DB_HOST, FILE__DB_NAME, FILE__DB_PASS, FILE__DB_USER.

This however does not allow to use other databases beside MySQL, so I added the option to use the variable CMD_DB_DIALECT which is the specified method according to the hedgedoc documentation.

This defaults to mysql, so if the variable is not set-up, the container will work as of now.

How Has This Been Tested?

I have built my hedgedoc instance using this changes, these changes allowed me to connect to a postgres database without leaking info in the compose file.

Source / References:

https://docs.hedgedoc.org/configuration/

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[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/hedgedoc/1.9.9-pkg-cc4728f5-dev-8c87e6e975db45c129e33837a77c072e1adb846c-pr-42/index.html
https://ci-tests.linuxserver.io/lspipepr/hedgedoc/1.9.9-pkg-cc4728f5-dev-8c87e6e975db45c129e33837a77c072e1adb846c-pr-42/shellcheck-result.xml

Tag	Passed
amd64-1.9.9-pkg-cc4728f5-dev-8c87e6e975db45c129e33837a77c072e1adb846c-pr-42	✅
arm64v8-1.9.9-pkg-cc4728f5-dev-8c87e6e975db45c129e33837a77c072e1adb846c-pr-42	✅

[xihh87]

@thespad, could you please check pull request #42 for docker-hedgedoc?

I think allowing the use of databases beyond mysql would be generally useful and doesn't need any other change.

The commits for this branch could be squashed.

[thespad]

Can you please explicitly list the possible options in the env description:

mysql, mariadb, sqlite, postgres

And while we're at it we should probably update the default to mariadb in the servicefile, as in most practical cases now that's what people are going to be using.

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/hedgedoc/1.9.9-pkg-cdbf7e6f-dev-21532170fb9bb3622d9513e0aeab0ea023898d4f-pr-42/index.html
https://ci-tests.linuxserver.io/lspipepr/hedgedoc/1.9.9-pkg-cdbf7e6f-dev-21532170fb9bb3622d9513e0aeab0ea023898d4f-pr-42/shellcheck-result.xml

Tag	Passed
amd64-1.9.9-pkg-cdbf7e6f-dev-21532170fb9bb3622d9513e0aeab0ea023898d4f-pr-42	✅
arm64v8-1.9.9-pkg-cdbf7e6f-dev-21532170fb9bb3622d9513e0aeab0ea023898d4f-pr-42	✅