add prepare_vars step

.github/workflows/dbt_integration_test.yml

@@ -3,7 +3,6 @@ run-name: ${{ github.event.inputs.branch }}
 
 on:
   workflow_dispatch:
-  workflow_call:
     inputs:
       environment:
         required: true
@@ -11,15 +10,25 @@ on:
 
 concurrency: ${{ github.workflow }}
 
-env:
-  WAREHOUSE: "${{ vars.WAREHOUSE }}"
-
 jobs:
+  prepare_vars:
+    runs-on: ubuntu-latest
+    environment: 
+      name: ${{ inputs.environment }}  
+    outputs:  
+      warehouse: ${{ steps.set_outputs.outputs.warehouse }}
+    steps:
+      - name: Set warehouse output
+        id: set_outputs
+        run: |
+          echo "warehouse=${{ vars.WAREHOUSE }}" >> $GITHUB_OUTPUT  
+
   called_workflow_template:
+    needs: prepare_vars
     uses: FlipsideCrypto/analytics-workflow-templates/.github/workflows/dbt.yml@main
     with:
       command: >
         dbt test --selector 'integration_tests'
-      environment:  ${{ inputs.environment }}
-      warehouse: ${{ vars.WAREHOUSE }}
+      environment: ${{ inputs.environment }}
+      warehouse: ${{ needs.prepare_vars.outputs.warehouse }}  
     secrets: inherit