Bump to node 18, .nvmrc, Dockerfile

[fuxingloh]

What would you like to be added:

Bump .nvmrc to node 18, docker image included.

Why is this needed:

For the maintenance of the project, node 16 is getting sunset with an earlier timeline.

[github-actions]

@fuxingloh: Thanks for opening an issue, it is currently awaiting triage.

The triage/accepted label can be added by foundation members by writing /triage accepted in a comment.

Details

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[github-actions]

@fuxingloh: There are no 'area' labels on this issue. Adding an appropriate label will greatly expedite the process for us. You can add as many area as you see fit. If you are unsure what to do you can ignore this!

You can add area labels by leaving a /area comment.

Details

I am a bot created to help the JellyfishSDK developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[fuxingloh]

/triage accepted
/area packages apps

[fuxingloh]

/priority important-soon