Introduce Hadolint

[szepeviktor]

"Lint" Dockerfiles.
https://github.com/hadolint/hadolint

From #104

[szepeviktor]

@tillkruss What do you think about OCI metadata?
https://github.com/szepeviktor/byte-level-care/blob/master/.hadolint.yaml

[tillkruss]

Should we add this to style.yml?

[szepeviktor]

I name actions based on what it cares about, not based on what it does.
E.g. "style" is a job in "back-end" and in "front-end" and in "yaml"
https://github.com/szepeviktor/byte-level-care/tree/master/.github/workflows

[szepeviktor]

If you organize workflows based on the activity you will end up with 5 totally different target types in "style.yml".

[szepeviktor]

First let's see its output!

[tillkruss]

I approved the run.

[szepeviktor]

Here is the output: https://github.com/szepeviktor/cachewerk_relay/actions/runs/5732711289/job/15536150993

• What rules (e.g DL3040) to you want to be corrected?
• What rules do you want to be ignored?

https://github.com/hadolint/hadolint#rules

[szepeviktor]

Here is the output sorted and grouped by rule code
👉🏻 https://gist.github.com/szepeviktor/16c82e95c3b08906b297a2262728a2bc

[tillkruss]

That's a lot of issues and they are pretty strict.

[szepeviktor]

That's the point of my work: prevent future problems.