feat(bundler): add option to disable CI for just the dmg bundler

[FabianLars]

Setting CI: false doesn't always work, for example in my tauri-action setting, this broke the update bundle signer for example. I didn't want to have a general GitHub check, even though i plan to set this env var in tauri-action and see what happens, so that we can switch quickly if needed.

[github-actions]

Package Changes Through 88008fe

There are 8 changes which include @tauri-apps/api with minor, tauri-bundler with minor, tauri-cli with minor, @tauri-apps/cli with minor, tauri with minor, tauri-runtime with minor, tauri-runtime-wry with minor, tauri-utils with patch

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	2.1.1	2.2.0
tauri-utils	2.1.0	2.1.1
tauri-bundler	2.1.0	2.2.0
tauri-runtime	2.2.0	2.3.0
tauri-runtime-wry	2.2.0	2.3.0
tauri-codegen	2.0.3	2.0.4
tauri-macros	2.0.3	2.0.4
tauri-plugin	2.0.3	2.0.4
tauri-build	2.0.3	2.0.4
tauri	2.1.1	2.2.0
@tauri-apps/cli	2.1.0	2.2.0
tauri-cli	2.1.0	2.2.0

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