Clean-up set instance syntax

.github/workflows/im-reusable-finish-deployment-workflow.yml

@@ -159,7 +159,7 @@ jobs:
       # Only run this step if Tech Hub metadata.name value
       # and a metadata.instance value are provided
       - name: Create GitHub Deployment
-        if: ${{ inputs.entity != null && inputs.instance != null }}
+        if: ${{ inputs.entity != null && (inputs.instance != null || inputs.target-slot != null) }}
         uses: im-open/[email protected]
         with:
           workflow-actor: ${{ github.actor }} # This will add the user who kicked off the workflow to the deployment payload
@@ -169,7 +169,7 @@ jobs:
           deployment-status: ${{ steps.conclusion.outputs.workflow_conclusion }}
           deployment-description: 'Deployment to the ${{ inputs.deployment-environment }} environment of ${{ inputs.release-tag }}'
           entity: ${{ inputs.entity }}
-          instance: ${{ inputs.instance || inputs.target-slot }}
+          instance: ${{ inputs.instance != null ? inputs.instance : inputs.target-slot }}
 
       - name: Configure facts for team's notification channel
         if: always()