Add labels to Docker image

[TobiX]

Hi!

First: Thanks for this tool. I have switched from MailHog und really like all the new features (tags, dark theme, etc.)

I currently have just a small request: Could you add some labels to the Docker image?

I think a fairly uncontroversial set would be:

LABEL org.opencontainers.image.source="https://github.com/axllent/mailpit" \
  org.opencontainers.image.url="https://mailpit.axllent.org/" \
  org.opencontainers.image.licenses="MIT"

This helps tools like Renovate (and Dependabot?) to link and embed changelogs into update PRs (for example when using docker images in Helm charts)

[axllent]

Thanks for this, I'll look into it and add something in the near future 👍

[axllent]

I've added the following to the Dockerfile:

LABEL org.opencontainers.image.title="Mailpit" \
  org.opencontainers.image.description="An email and SMTP testing tool with API for developers" \
  org.opencontainers.image.source="https://github.com/axllent/mailpit" \
  org.opencontainers.image.url="https://mailpit.axllent.org" \
  org.opencontainers.image.documentation="https://mailpit.axllent.org/docs/" \
  org.opencontainers.image.licenses="MIT"

I trust this will be sufficient?

Unless you have good reason to require this "now", I'll wait until I have a few more changes before releasing a new version 👍

[TobiX]

Thanks! I think that's reasonable.

[axllent]

This has finally been released in v1.15.1 👍

Please confirm it works as you expect?

[TobiX]

Sorry for the late reply, can confirm it works now, see TobiX/test-renovate-stuff#7