Fix apim env

Author: stevebux

.github/actions/build-proxies/action.yml

@@ -72,11 +72,11 @@ runs:
 
     - name: Trigger deploy proxy
       env:
-        APIM_ENV: ${{ inputs.apimEnv }}
         APP_CLIENT_ID: ${{ env.APP_CLIENT_ID }}
         APP_PEM_FILE: ${{ env.APP_PEM_FILE }}
       shell: bash
       run: |
+        ENV="${{ inputs.apimEnv }}"
         .github/scripts/dispatch_internal_repo_workflow.sh \
           --infraRepoName "nhs-notify-supplier-api" \
           --releaseVersion "${{ inputs.releaseVersion }}" \