Docker image

[tyranron]

This is a proposed implementation of smf-spf Docker image discussed in #23.

Features

• alpine image is used for result image to be small.
• s6-overlay is used as supervisor for supervising syslogd that is required for capturing logs of smf-spf.
• nobody user is used to run smf-spf, as it's already present in image.
• implements ability to specify configuration drop-ins in /etc/smfs/conf.d/ directory.
• listening on inet:8890 by default, but this can be reconfigured to listen unix sockets in /var/run/smfs/ mounted directory.

To discuss

• VERSION in Makefile. Should it be set statically, or fetched from Git tags automatically (pros/cons)?

TODO

• Dockerfile
• make aliases for manual image building/tagging/pushing
• tests & upd Travic CI matrix
• post_push Docker Hub hook generation for automated builds on GitHub
• describe Docker stuff in README.md

[codecov-io]

Current coverage is 63.47% (diff: 100%)

Merging #29 into master will not change coverage

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  Files             1          1          
  Lines           460        460          
  Methods          19         19          
  Messages          0          0          
  Branches        200        200          
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  Hits            292        292          
  Misses           84         84          
  Partials         84         84          

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[jcbf]

I'm merging this and better open different issues/pull-requests for the pending stuff

[tyranron]

@jcbf wow, that was accidentally.
Ok, I'll complete the stuff in separate PRs.