Set mailman to always restart

[icarito]

This is meant to force mailman container to restart on failures (it crashes in production).

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• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with rake test
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We're happy to help you get this ready -- don't be afraid to ask for help, and don't be discouraged if your tests fail at first!

If tests do fail, click on the red X to learn why by reading the logs.

Please be sure you've reviewed our contribution guidelines at https://publiclab.org/contributing-to-public-lab-software

Thanks!

[plotsbot]

	3 Messages
📖	@icarito Thank you for your pull request! I’m here to help with some tips and recommendations. Please take a look at the list provided and help us review and accept your contribution! And don’t be discouraged if you see errors – we’re here to help.
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