Add a launch task for starting the app but not launching a browser

[therealjohn]

It can be slow and unnecessary to constantly launch a new browser and add the app every time you want to iterate on your Teams app. This is only really necessary if the manifest changes. Instead, a simpler launch profile that just starts the app and does not launch Teams in a browser can be used in combination with an already open Teams browser or desktop client.

For example:

Use the Start Debugging launch task to start the app, connect the debugger, etc. and then alt-tab or switch over to a desktop Teams client.

1. If the app wasn't uploaded yet, or the manifest changed, use the Apps > Manage your apps > Upload a custom app button.
   

• Select the ../appPackage/build/myapp.local.zip for your project to add the app

2. If the app is already added and the manifest hasn't changed, switch back to your app in a Teams client and continue iterating.

This is much faster than waiting for the browser to launch, authenticate, Add app dialog, etc.

In the new 2.1 Teams desktop client its also fast to switch accounts or tenants, so if you are debugging an app in a different account you can switch to that easily.

All that was needed to support this was just modifying the .vscode/launch.json to have this:

"compounds": [
        {
            "name": "Start Debugging",
            "configurations": [
                "Attach to Local Service"
            ],
            "preLaunchTask": "Start Teams App Locally",
            "presentation": {
                "group": "1",
                "order": 0
            },
            "stopAll": true
        },
...

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