adds Dockerfile, can add a PR later for publishing

[iMartyn]

Dockerfile that creates a simple clean debian-based container, grabbing the libraries needed using ldd.

If you like I can craft a github action that adds a build and publish to ghcr.io (github container registry), so people can pull the docker image and just use it.

Also I can probably contribute a helm chart for kubernetes :-)

[iMartyn]

This needs more, it seems, rust is fine but node for node-red gui is needed.

[iMartyn]

Should be good to run once #15 is working. I've tested it with socat running in the container and firefox loads the ui. There were a couple of error messages on first load but I don't know if it's the docker image or the fact that it's edgelinkd not nodered at the backend.

There's for sure more that the Dockerfile could do such as taking env vars to influence the command-line parameters etc. but we can iterate there, especially as I don't know if you plan to do that natively in rust at some point.

P.S. I'm probably not going to look at this for another week because I'm away. I used my travel time to work this up :-)

[oldrev]

First of all, thank you very much for your contribution.

Your Dockerfile looks good, but you may have misunderstood the current state of the project. It's basically a working prototype at this point and is still far from being something people can actually "use".

Plus, my primary target platform is ultra-low-memory embedded Linux systems (e.g., 64MB or even 32MB), where using Docker doesn't really make sense.

[iMartyn]

Yeah, that's understandable, and yes, I get that the target is lower-memory systems, but I run everything in kubernetes, even on low-memory systems, such as SBCs with (admittedly hugely more than your example) of 512Mb ram. I still think that there is benefit for switching from node-red full to edgelinkd for those of us who want a more streamlined approach on "bigger" machines. Docker doesn't actually add much overhead in ram usage, disk usage, absolutely, but not ram or CPU. Anyway, if you don't want the overhead of maintaining it if you accepted the PR, that's fine, I'll still probably host it myself, just y'know, being a good open-source citizen and giving back upstream :-)