add volume to database container for persisting data

[HassanJbara]

• add volume to database container in docker-compose
• add db-data folder to gitignore

[netlify]

👷 Deploy request for catanatron-staging pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	fc7ae6c

[bcollazo]

LGTM

[coveralls]

Pull Request Test Coverage Report for Build 9813138060

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.871%

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Totals
Change from base Build 9793608623:	0.0%
Covered Lines:	1370
Relevant Lines:	1429

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💛 - Coveralls