Leaner docker image

[hcebke]

No description provided.

[pakerfeldt]

While I like the suggestion to make the image more lean, this suggestion has a couple of downsides as well. Debugging will get harded, it's no longer possible to exec into the image and without debug symbols I would assume stacktraces are not readable anymore. Using scratch would, AFAIU, render TLS useless unless you provide certificates manually to the image. WIth CGO_ENABLED=0 we are relying on Go's built-in DNS resolver which could also have an unexpected effect, although maybe not so likely.

I'm all for making the image smaller, but if we want to go this far then at least we should provide this as an alternative to another standard image.

[hcebke]

Those are fair points.
I've added the minimal image as knx-mqtt-minimal and restored the original one as knx-mqtt. This way, using docker build --target you can choose which one you want.
What do you think?

[pakerfeldt]

Love it! Will review this and the other PRs in the coming days