Added Canary tests related documentation and few more cases(#232)

.github/workflows/azure-login-canary.yml

@@ -30,19 +30,47 @@ jobs:
            az --version
            
       - name: Check out repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         
-      - name: 'Az CLI login non-oidc'
-        uses: 'azure/login@v1'
+      - name: 'Az CLI login with subscription'
+        uses: azure/login@v1
         with:
           creds: ${{ secrets.AZURE_CREDENTIALS }}
-
-      - name: 'Az CLI login oidc'
-        uses: 'azure/login@v1'
+          
+      - run: |
+          az account show
+          
+      - name: 'Az CLI login without subscription'
+        uses: azure/login@v1
+        with:
+          creds: ${{ secrets.AZURE_CREDENTIALS }}
+          allow-no-subscriptions: true
+          
+      - run: |
+          az account show
+          
+      - name: 'Az CLI login with subscription OIDC'
+        uses: azure/login@v1
         with:
           client-id: ${{ secrets.AZURE_CLIENTID }}
           tenant-id: ${{ secrets.AZURE_TENANTID }}
-          subscription-id: ${{ secrets.AZURE_SUBSCRIPTIONID }}
+          subscription-id: ${{ secrets.AZURE_SUBSCRIPTIONID }} 
+        
+      - run: |
+          az account show
+          
+      - name: 'Az CLI login without subscription OIDC'
+        uses: azure/login@v1
+        with:
+          client-id: ${{ secrets.AZURE_CLIENTID }}
+          tenant-id: ${{ secrets.AZURE_TENANTID }}
+          allow-no-subscriptions: true
+          
+      - run: |
+          az account show
+          
+   
+          
   slack-post-result:
         runs-on: ubuntu-latest
 #         continue-on-error: true

README.md

@@ -301,7 +301,8 @@ This action doesn't implement ```az logout``` by default at the end of execution
       az cache purge
       az account clear
 ```
-
+## Az CLI dependency
+Internally in this action, we use azure CLI and execute `az login` with the credentials provided through secrets. In order to validate the new az CLI releases for this action, [canary test workflow](.github/workflows/azure-login-canary.yml) is written which will execute the action on [az CLI's edge build](https://github.com/Azure/azure-cli#edge-builds) which will fail incase of any breaking change is being introduced in the new upcoming release. The test results can be posted on a slack or teams channel using the corresponding integrations. Incase of a failure, the concern will be raised to [azure-cli](https://github.com/Azure/azure-cli) for taking a necessary action and also the latest CLI installation will be postponed in [Runner VMs](https://github.com/actions/virtual-environments) as well for hosted runner to prevent the workflows failing due to the new CLI changes.
 # Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a