fix pg_hint_plans extension install for 9.6 and 10

Author: DmitryFomin1

extended/Dockerfile

@@ -1,4 +1,4 @@
-ARG PG_SERVER_VERSION=11
+ARG PG_SERVER_VERSION=9.6
 ARG CITUS=9.4
 
 FROM postgres:${PG_SERVER_VERSION}
@@ -10,15 +10,11 @@ ENV PG_SERVER_VERSION=${PG_SERVER_VERSION:-12}
 ENV CITUS_VERSION=9.4
 
 RUN apt-get update \
-    && apt-get install --no-install-recommends -y wget make gcc unzip sudo \
+    && apt-get install --no-install-recommends -y wget make gcc unzip sudo git curl libc6-dev apt-transport-https ca-certificates\
     && apt-get install --no-install-recommends -y postgresql-server-dev-${PG_SERVER_VERSION} \
     && apt-get install --no-install-recommends -y postgresql-${PG_SERVER_VERSION}-repack \
     && apt-get install --no-install-recommends -y postgresql-${PG_SERVER_VERSION}-hypopg \
-    && apt-get install --no-install-recommends -y postgresql-${PG_SERVER_VERSION}-hypopg-dbgsym \
-    && apt-get install --no-install-recommends -y apt-transport-https \
-    && apt-get install --no-install-recommends -y ca-certificates \
-    && apt-get install --no-install-recommends -y git \
-    && apt-get -y --no-install-recommends install curl
+    && apt-get install --no-install-recommends -y postgresql-${PG_SERVER_VERSION}-hypopg-dbgsym 
 
 RUN if [ "${PG_SERVER_VERSION}" = "12" ]; then \
         # pg_hint_plan for Postgres 12 does not supported yet, use master: https://github.com/ossc-db/pg_hint_plan/issues/37
@@ -67,7 +63,7 @@ RUN apt-get -y install postgresql-${PG_SERVER_VERSION}-cron
 
 # Reduce images size.
 RUN rm -rf /tmp/* \
-    && apt-get purge -y --auto-remove gcc make wget unzip curl apt-transport-https git postgresql-server-dev-${PG_SERVER_VERSION} \
+    && apt-get purge -y --auto-remove gcc make wget unzip curl libc6-dev apt-transport-https git postgresql-server-dev-${PG_SERVER_VERSION} \
     && apt-get clean -y autoclean \
     && rm -rf /var/lib/apt/lists/* \
     && rm -rf /pg_show_plans \