docs(cli): document TAURI_SIGNING_PRIVATE_KEY_PATH and clarify key vars

[lazerg]

TAURI_SIGNING_PRIVATE_KEY_PATH was missing from the reference even though tauri signer sign reads it. The old wording also glossed over how build/bundle accept the key as a string or a path, while signer sign only takes the literal string. So this adds the var and spells out that difference. #15028

[Legend-Master]

Thanks! Could you also update the sign generate command's output and add a change file?

https://github.com/tauri-apps/tauri/blob/dev/.changes/README.md

Also you'll need to sign your commits for me to merge this

https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits

[lazerg]

Done, updated the signer generate output to match and added a change file.

[Legend-Master]

Thanks. Please upload your signing public key to GitHub so I can merge this.

[lazerg]

✅

[github-actions]

Package Changes Through acb71ee

There are 14 changes which include tauri with minor, tauri-cli with minor, @tauri-apps/cli with minor, tauri-runtime with minor, tauri-runtime-wry with minor, tauri-utils with minor, tauri-bundler with minor, tauri-build with minor, tauri-macos-sign with minor, tauri-codegen with minor, tauri-macros with minor, tauri-plugin with minor, tauri-driver with minor, @tauri-apps/api with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.11.1	2.12.0
tauri-utils	2.9.3	2.10.0
tauri-macos-sign	2.3.4	2.4.0
tauri-bundler	2.9.4	2.10.0
tauri-runtime	2.11.3	2.12.0
tauri-runtime-wry	2.11.4	2.12.0
tauri-codegen	2.6.3	2.7.0
tauri-macros	2.6.3	2.7.0
tauri-plugin	2.6.3	2.7.0
tauri-build	2.6.3	2.7.0
tauri	2.11.5	2.12.0
@tauri-apps/cli	2.11.4	2.12.0
tauri-cli	2.11.4	2.12.0
tauri-driver	2.0.6	2.1.0

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