Nginx websocket fix

[Avarios]

PR Checklist:

• Provide a meaningful description to this PR or mention which issues this fixes.
• Ensure the project builds with npm run build
• Add tests for your change. This includes negative tests (i.e. inputs that need to fail) as well as baseline tests (i.e. how should the directory structure look like?).
• Run the test suite with npm test
• If there are baseline changes, review them and make a separate commit for them with the comment "accept baselines" if they are desired changes
• If you added a required option, also add it to the template creation (.github/create_templates.ts)
• Add a detailed migration description to docs/updates explaining what the user needs to do when manually updating an existing project
• Add your changes to CHANGELOG.md (referencing the migration description and this PR or the issue you fixed)

Description:
In the current Version the dev container is spinning up a NGINX.
IOBroker is using WebSockets for some Operations but with the current config, it fails to reach the websocket.
With my change, the websocket connection is reachable again

[hacki11]

Had the same issue today, that the connection via nginx is not working. The websocket config was not complete.

The proposed solution works for me!

[hacki11]

@Avarios do you mind working through the checklist? @AlCalzone are there any concerns from your side or can we bring it to master?

[UncleSamSwiss]

The changes look reasonable to me. If it is working, then the only thing left to do is to complete the PR checklist. Once this is done and all checks are green, I can merge this PR.

[AlCalzone]

Plus what the others said.

[AlCalzone]

This also needs a migration guide for users who want to modify their existing setups.

[Avarios]

Hi all, ill need two more weeks for this, it is not forgotten my time is very limited :D

[hacki11]

Hi all, ill need two more weeks for this, it is not forgotten my time is very limited :D

I have included your fix in #1137 where I have completed documentation an checklist already.

[Avarios]

Hi all, ill need two more weeks for this, it is not forgotten my time is very limited :D

I have included your fix in #1137 where I have completed documentation an checklist already.

Cool, less work for me :D Thank you

[Apollon77]

Ok, then I close here in favor of #1137