Add static asset service user docs

[cstns]

Description

Add static asset service user docs

Related Issue(s)

none

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[joepavitt]

Any reason for the draft? Or can I review?

[cstns]

There's an open question on dpt eng about some points in the docs that would need clarifying

[cstns]

about the limitations section*

[hardillb]

@cstns how are we doing with this?

[cstns]

I need to update the limitations section.
I have an answer for Unsupported characters, which ill make a vague remark about depending on file system, but the other two remain unanswered:
- Allowed MIME types: // todo couldn't find any on the BE or localfs driver
- Team permissions required: owner // to be confirmed or rephrased

[hardillb]

We do not care about mime types for the currently deployed code, everything is just uploaded as binary blob.

We may want to think about mime types for when sharing is enabled, but that is part of the next release (and we are going to default to what Node-RED already does).

[hardillb]

Only Owner and Members should be able to access the Assests tab.

[cstns]

As we stand, viewer type roles have access to the assets tab, but cannot retrieve assets so the list is always empty. The asset action buttons are still enabled (refresh, new folder and upload).

Should I create another issue or do a quick fix in this one?

I can also remove the mime type restriction from the docs until we implement it.

[hardillb]

Raise an issue for the Viewer stuff.

Remove the mime stuff

[cstns]

linking #4439

[hardillb]

Also probably need a link from docs/users/index.md in the "Working with Files and Context" section

[hardillb]

Raised follow up #4440 to clean up file node docs.