Set restart policy of webserver to "always"

[trey-stafford]

Description

Ensures that the service will come back after a VM reboot, which we expect to happen frequently as part of security updates applied by SAs at NSIDC.

Resolves https://github.com/nsidc/qgreenland-vm/issues/3

Checklist

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• The PR description links to issues that it resolves with closes #{issue_number}
• Config lockfile updated (inv config.export > qgreenland/config/cfg-lock.json)
• Environment lockfile updated if needed (conda-lock)
• Version bumped if needed (bumpversion (major|minor|patch|prerelease|build))
• CHANGELOG.md updated (for user-facing changes)
• Documentation updated if needed
• New unit tests if needed

[rmarow]

approving! We tested on Dev!

[mfisher87]

@trey-stafford @rmarow You may want to consider "unless-stopped". "always" will restart the container even if you manually do docker compose down, which I think is not what you want. "unless-stopped" won't do that, but will restart the container when the engine or host are shutdown.