fix packer install

.github/workflows/weekly-e2e.yaml

@@ -27,6 +27,7 @@ jobs:
           export ARM_SUBSCRIPTION_ID=${{ secrets.ARM_SUBSCRIPTION_ID }}
           export ARM_TENANT_ID=${{ secrets.ARM_TENANT_ID }}
           export ARM_CLIENT_ID=${{ secrets.ARM_CLIENT_ID_CRONTEST }}
+          export PACKER_VERSION=${{ vars.PACKER_VERSION }}
           docker run --rm -v $(pwd):/src -w /src/test --network=host -e ARM_SUBSCRIPTION_ID -e ARM_CLIENT_ID -e ARM_TENANT_ID -e ARM_OIDC_REQUEST_TOKEN -e ARM_OIDC_REQUEST_URL -e ARM_USE_OIDC=true -e CHANGED_FOLDERS mcr.microsoft.com/azterraform sh -c "pkenv install $PACKER_VERSION && go mod tidy && go test -timeout=1440m -parallel 10 -v ./e2e"
       - name: Update
         run: |