Extended docker support

[maxmeyer]

Preface

This incorparates all changes from #27 (/cc @dexafree) rebased to current master and reduces the image size by using the multistaged build feature from docker. This also reduces the surface for attacks by reducing the amount of installed packages.

Additions

• Multistaged docker build - minimal Alpine Linux Image for the image
• Build/Setup-scripts to make it easier for newcomers to get started
• Extend documentation about how to run the docker container

[dexafree]

Seems great to me.
Would you maybe consider using a Makefile instead of 3 different scripts for the setup?

I could help with that.

[maxmeyer]

@dexafree I thought about that too, but in the end having those scripts is more obvious than a single file - also see https://githubengineering.com/scripts-to-rule-them-all/. But I'm happy to add a simple Makefile which can act as another entrypoint. This is what I do in my projects normally, having both the scripts and the Makefile.

[maxmeyer]

@dexafree Done.

[maxmeyer]

@RadhiFadlillah If you wonder, what this tool is for: https://github.com/Yelp/dumb-init:

dumb-init is a simple process supervisor and init system designed to run as PID 1 inside minimal container environments (such as Docker). It is deployed as a small, statically-linked binary written in C.

[RadhiFadlillah]

Thanks @maxmeyer.

BTW, I think we don't really need to add those additional scripts, especially since go command is already simple enough to use. For example, setup is just wrapper for go get and build is just wrapper for go build.

[RadhiFadlillah]

Here, we can just use go build -o shiori

[RadhiFadlillah]

Here, we can just use go get -d -v ./..

[maxmeyer]

If there's a decision for #70 this needs to be replaced by bin/docker/build.

[RadhiFadlillah]

Thanks a lot @maxmeyer, I will take a look at #70 later.

[maxmeyer]

Thanks @RadhiFadlillah. I'm looking forward for the next release of shiori. 😄

[maxmeyer]

@RadhiFadlillah Awesome! I just realized, that you just setup the automated docker build! 👍