collections/Documents: allow other MIME types

[stevekuznetsov]

One of our users has an urgent use-case for uploading XML and PHP files.

[github-actions]

Preview deployment: https://skuznetsxexpose-more-types.preview.avy-fx.org

[andyanderso]

Thanks guys!

[andyanderso]

Thanks, everyone. The KML file works great.

The .php file still throws an error when I try to upload it. PHP is a bit trickier, since the server would have to run the PHP file to generate the JSON that we use to create the wx forecast.
Here is how it currently works:

• The AFP has a button that says load custom wx table.
• When we click that button, it pings https://archive.sierraavalanchecenter.org/sites/all/libraries/avalanche.org-API-Client/SAC_WxConfigJSON.php
• The php file then pulls info from the NWS api for the current mountain weather forecast, parses it, and outputs a JSON file.
• The AFP uses that JSON file to build and populate our custom weather table.

I'm not sure if the avy-web server is configured to support PHP. We could rewrite the script in another language if needed, but I don't have time to do so during the forecasting season. For now, I have it hosted in two places. Surely they won't both go down at the same time :-)