Proposal: Make a common base image

[zhujian7]

Proposal: Make a common base image

Background

There are many component images in Cyclone, cyclone-server, cyclone-workflow-controller, cyclone-workflow-coordinator, etc. They use a different base image, such as alpine:3.8 ubuntu:18.10 and bash:4.1.17, and almost every image built needs to connect to the network, installing subversion, installing docker and so on.

Disadvantages of that:

• we can not build even one Cyclone image in a no network environment
• we must do some duplicated works, like downloading subversion, in some images building.

Proposal

I think we can:

• Unify all base image form alpine:3.8 ubuntu:18.10 and bash:4.1.17 to alpine:3.8.(almostly done except for sonarqube)
• Then creates a common base image based on alpine:3.8 and installed all tools from the internet for other component images. Naming the common base image is difficult for me, how about cyclone-base?

Advantages

Could resolve problems described in the background

Disavantages

Some images may container some tools they don't need and make their size bigger than before. But I think that is acceptable.

/cc @supereagle @hyy0322 @bbbmj

Uncomment only one, leave it on its own line:

/kind proposal

What happened:

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[zhujian7]

@supereagle @hyy0322 WDYT?

[hyy0322]

LGTM, Using a common base image will make it easier to maintain. Although it may cause cyclone base image size larger.

[supereagle]

Generally SGTM

• Naming the common base image is difficult for me, how about cyclone-base?

You can refer to other popular projects for best practices.