How to use pipeline azure-web-apps-deploy for blue/green deployment to slots?

[Neil Padgen]

I have an application hosted on Azure, which uses the pipeline `atlassian/azure-web-apps-deploy`.  I'd like to use Azure slots to achieve blue/green deployment.

I see I can set a repository variable of SLOT, but this seems to be fixed.

What I'd like is:

1. deploy the application to the "blue" slot
2. route all requests to the "blue" slot
3. next deploy will go to the "green" slot
4. run some tests on the "green" slot
5. route all requests to the "green" slot
6. next deploy will go to the "blue" slot
7. run some tests on the "blue" slot
8. repeat from step 2

How can I construct a pipeline that will work in this way?