chore: add deployment config option to append custom csp directives #15596
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Allows adding custom static CSP directives to Coder. Niche use case but makes this easier then creating a reverse proxy that has to replace the header. We want to preserve our directives, so having an append option is preferred to a "replace" option via a reverse proxy.
Closes #15118
Some notes
We do not validate the directives set. Browsers have different sets of support, so we accept any string values.
Example configuring. The format matches the header format.