Added gzip package to server / proxy images

Dockerfiles/server-pgsql/alpine/Dockerfile

@@ -53,6 +53,7 @@ RUN set -eux && \
             pcre \
             postgresql-client \
             postgresql-libs \
+            gzip \
             unixodbc" && \
     apk add \
             --no-cache \

Dockerfiles/server-pgsql/centos/Dockerfile

@@ -57,6 +57,7 @@ RUN set -eux && \
             postgresql \
             postgresql-libs \
             zlib \
+            gzip \
             unixODBC" && \
     dnf -y install epel-release && \
     dnf -y install \

Dockerfiles/server-pgsql/ubuntu/Dockerfile

@@ -57,6 +57,7 @@ RUN set -eux && \
             libxml2 \
             postgresql-client \
             snmp-mibs-downloader \
+            gzip \
             unixodbc" && \
     apt-get -y update && \
     DEBIAN_FRONTEND=noninteractive apt-get -y \