chore(workflow): DOCKER_REGISTRIES_FILTERED from env not secret (#296)

Author: flowftw

.github/workflows/build.yml

@@ -56,7 +56,7 @@ jobs:
         run: |
           earthly +docker-publish \
             --PUSH=${DOCKER_PUSH} \
-            --DOCKER_REGISTRIES="${{ secrets.DOCKER_REGISTRIES_FILTERED }}" \
+            --DOCKER_REGISTRIES="${{ env.DOCKER_REGISTRIES_FILTERED }}" \
             --DOCKER_IMAGES_EXTRA_TAGS="${EARTHLY_DOCKER_IMAGES_EXTRA_TAGS}" \
             --GITLAB_MAVEN_REGISTRY_URL="${GITLAB_MAVEN_REGISTRY_URL}"