fix: create url safe db passwords

[tobenna]

Closes #1796

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• I have followed every step in the contributing guide (updated 2022-10-06).
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Changelog

openssl rand -base64 12 can create passwords with + and / characters which when used as database urls have to be encoded.
In this modification, I introduced tr '+/' '-_' immediately after the openssl rand -base64 12 command to replace + with - and / with _, making the generated base64 string URL-safe. This ensures that the DB_PASSWORD variable will contain a URL-safe string that can be used directly in database URLs without further encoding.

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