[openstreetmap/openstreetmap-website] Content Security Policy prevents sharing (Issue #6214)

[ckdexterhaven]

ckdexterhaven created an issue (openstreetmap/openstreetmap-website#6214)

### URL

_No response_

### How to reproduce the issue?

On a PC (not a MAC), using any current browser, select a map area.
Select Share, and any of the format options (I was looking for an SVG file)
Click Download.
You'll immediately get an error - displayed in developer tools: **/#map=16/34.57934/-119.96656&layers=T:1 Refused to send form data to 'https://www.openstreetmap.org/export/finish' because it violates the following Content Security Policy directive: "form-action 'self' render.openstreetmap.org".**

As this is a complete show-stopped I'm at odds why this hasn't been reported. All of my collogues, in several offices experience the same. 
THX! 

### Screenshot(s) or anything else?

_No response_

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