Reduce hardcoding of amd64 to make the dev experience more pleasant on M1 Macs

[jeffwidman]

Running bin/dev-docker-shell on my M1 Mac throws this warning:

/C/d/dependabot-core ❯❯❯ bin/docker-dev-shell
 > image dependabot/dependabot-core-development already exists

=> running docker development shell
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
[dependabot-core-dev] ~/dependabot-core $

Grep'ing the repo I see a bunch of amd64 hardcoding: https://github.com/dependabot/dependabot-core/search?q=amd64

Ideally the architecture would depend on the host platform... that's likely not feasible everywhere, but perhaps some of these could be switched to dynamically picking the architecture. That way if someone is debugging a single ecosystem, possibly it could run natively on arm / apple silicon.

That'd result in a more pleasant dev experience, especially as more and more devs switch to the M1 / M2 apple laptops.

[deivid-rodriguez]

mmm just a warning? I couldn't get it to build at all on my machine, any hints?

[thepwagner]

Related #4697

[jeffwidman]

@deivid-rodriguez I can't get the Dockerfile to build following these instructions due to a problem with terraform packages.

But I could pull the latest pre-built docker image following these instructions:
https://github.com/dependabot/dependabot-core#running-with-docker

And then it seems to run fine, other than the warning mentioned in my first post.

So as long as you're not needing to modify the source Dockerfile, you should be okay for now.

[deivid-rodriguez]

Ah, alright, I'll try that then 👍.

[jeffwidman]

Closing as this was partially addressed by #4858 and this ticket is so broad that it's not super actionable... with the popularity of the M1 laptops, I'm sure we'll soon flush out any additional bugs and tackle them one-by-one.