fix: move deps to app stage

[2color]

Description

Moves tini and curl to the app stage of the docker build.

This fixes curl which wasn't working as it relies on shared libs:

ubuntu@libp2p-bootstrap-js:~$ docker exec -it js-libp2p bash
root@libp2p-bootstrap-js:/app# curl
curl: error while loading shared libraries: libcurl.so.4: cannot open shared object file: No such file or directory

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works

[achingbrain]

LGTM

[achingbrain]

A multistep build on such a simple container seems like overkill to me, but we can fix that later if we want to.

[2color]

Simplified the image. Was also a good chance to test building and running it locally

[github-actions]

🎉 This PR is included in version 1.5.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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