Update app.js - process.env.STATE_STORE_NAME

[mathieu-benoit]

Description

Allow to change the STATE_STORE_NAME for the Node app via an environment variable. Default still remain statestore if no value is supllied in this environment variable. So no side effect with existing behavior/configuration/docs.

The use case is when the name of the associated Component created for me is not statestore, I need a way to dynamically change this value without having to change the code and rebuild/repackage the Node app.

Issue reference

None yet, let me know if you want I create one.

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[paulyuk]

Hi @mathieu-benoit thank you for the contribution. While it adds the slightest complexity to quickstart I'm good with it and the value it brings. Is there any chance you'd be willing to contribute this in all the rest of the languages?

[paulyuk]

LGTM, thank you for the contribution @mathieu-benoit

[mathieu-benoit]

Thanks for your review, @paulyuk! And sorry for the delay on getting back to you.

it adds the slightest complexity to quickstart

Just to make sure, it doesn't add any complexity in the sense that's optional/seemless and that the default behavior, not passing the STATE_STORE_NAME will take the previous/default value, right?

Is there any chance you'd be willing to contribute this in all the rest of the languages?

Happy to do so, just to make sure, it's just about the Python one, right? https://github.com/dapr/quickstarts/tree/master/tutorials/hello-world/python