Capacitor missing keystore options

I am trying to build an Android mobile app with CapacitorJS. I believe I have followed all the steps to get it setup, but when I run npx cap build android I get the error message below:

[error] Missing options. Please supply all options for android signing. (Keystore Path, Keystore Password, Keystore Key Alias, Keystore Key Password)

I have built an app before and did not have to supply these variables, and I can’t find any information on Google on how or where to store them. I am working in a local dev environment and not trying to push to the store if that matters.

Can anyone please tell me what these are, why I am suddenly being asked for them, and how I’m supposed to provide them?