Fix doubling-up of forward slashes in Dockerfile healthcheck.

Dockerfile

@@ -203,7 +203,7 @@ RUN rm superset/translations/*/*/*.po
 COPY --from=superset-node /app/superset/translations superset/translations
 COPY --from=python-translation-compiler /app/translations_mo superset/translations
 
-HEALTHCHECK CMD curl -f "http://localhost:${SUPERSET_PORT}/${SUPERSET_APP_ROOT}/health"
+HEALTHCHECK CMD /app/docker/docker-healthcheck.sh
 CMD ["/app/docker/entrypoints/run-server.sh"]
 EXPOSE ${SUPERSET_PORT}
 

docker/docker-healthcheck.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+curl -f "http://localhost:${SUPERSET_PORT}/${SUPERSET_APP_ROOT/\//}/health" || exit 1