Feature Request: Client SSL certificate with Home Assistant

[Gunni]

I noticed https://github.com/patzly/grocy-android/issues/510 was closed as not planned 2 years ago.

But, the Home Assistant app now supports mTLS and your app even seems to support it too, as long as I do not select the Home Assistant mode, I get prompted for a cert when connecting, but it does not do so when using HA mode.

Please use the same client cert logic regardless of mode.

1. Enter HA URL and no api key, click Login
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   • Observe that this error is a 404 error, which is a HTTP error, http does not happen until mTLS handshake is completed.
2. Click back
3. Click the Home Assistant box
4. Type anything in Long-lived access token and Ingress proxy identifier
5. Click Login
   • 
   • Observe mTLS failed because client certificate was not provided in the handshake