Add install ssh

Author: vshepard

Dockerfile.tmpl

@@ -9,6 +9,10 @@ RUN if [ "${PYTHON_VERSION}" = "3" ] ; then \
 	apk add --no-cache curl python3 python3-dev build-base musl-dev \
     linux-headers py-virtualenv; \
 	fi
+
+# Install OpenSSH
+RUN apk add --no-cache openssh
+
 ENV LANG=C.UTF-8
 
 RUN mkdir -p /pg
@@ -19,5 +23,8 @@ ADD . /pg/testgres
 WORKDIR /pg/testgres
 RUN chown -R postgres:postgres /pg
 
+# Expose SSH port
+EXPOSE 22
+
 USER postgres
 ENTRYPOINT PYTHON_VERSION=${PYTHON_VERSION} /run.sh