Fix vars reference

Author: sjonpaulbrown

.github/workflows/builds.yml

@@ -122,7 +122,7 @@ jobs:
         IMAGE_TAG: ${{ inputs.docker_tag }}
         CADENCE_DEPLOY_KEY: ${{ secrets.CADENCE_DEPLOY_KEY }}
       run: |
-        make docker-build-${{ matrix.role }}-with-adx docker-push-${{ matrix.role }}-with-adx CONTAINER_REGISTRY=${{ github.event.inputs.private_build && var.PRIVATE_REGISTRY || var.PUBLIC_REGISTRY }}
+        make docker-build-${{ matrix.role }}-with-adx docker-push-${{ matrix.role }}-with-adx CONTAINER_REGISTRY=${{ github.event.inputs.private_build && vars.PRIVATE_REGISTRY || vars.PUBLIC_REGISTRY }}
 
     - name: Build/Push ${{ matrix.role }} amd64 images without netgo and without adx, arm64 images
       if: ${{ inputs.include_alternative_builds }}