Tag <major> and "stable" versions of docker images

[docwhat]

Currently, the tags in docker.io are:

• latest and derivatives: slim, alpine, and artifacts
• vM.m.p and derivatives. Where M is major, m is minor, and p is patch à la semver.

I would propose adding one or both of:

• stable and derivatives. e.g. stable-slim
• vM and derivatives. e.g. v3, v3-alpine

The vM is the most valuable as it lets people using gomplate in (for example CI) to prevent breakages due to new-breaking features (major release as per semver).

[hairyhenderson]

@docwhat Thanks for logging this! It's been on my mind for a while, and I definitely want to do this.

And I agree and thing both stable and stable-*, and vM and vM-* are useful.

I'll get working on this soon 😉

[docwhat]

WOOT!

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