[Solr] Use new Solr base

data/Dockerfiles/solr/Dockerfile

@@ -1,11 +1,23 @@
-FROM solr:7.7-alpine
+FROM solr:7.7-slim
+
 USER root
+
+ENV GOSU_VERSION 1.11
+
 COPY docker-entrypoint.sh /
 COPY solr-config-7.7.0.xml /
 COPY solr-schema-7.7.0.xml /
 
-
-RUN apk --no-cache add su-exec curl tzdata \
+RUN dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')" \
+  && wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch" \
+  && chmod +x /usr/local/bin/gosu \
+  && gosu nobody true \
+  && apt-get update && apt-get install -y --no-install-recommends \
+  tzdata \
+  curl \
+  bash \
+  && apt-get autoclean \
+  && rm -rf /var/lib/apt/lists/* \
   && chmod +x /docker-entrypoint.sh \
   && sync \
   && bash /docker-entrypoint.sh --bootstrap