Remove backup-restorer.sh hack from pbmctl docker, now that s3 restor…

…es are fixed (#193)

docker/pbmctl/Dockerfile

@@ -1,29 +1,11 @@
-FROM centos:7
-MAINTAINER Percona Development <[email protected]>
+FROM alpine
 
-# check repository package signature in secure way
-RUN export GNUPGHOME="$(mktemp -d)" \
-        && gpg --keyserver ha.pool.sks-keyservers.net --recv-keys 430BDF5C56E7C94E848EE60C1C4CBDCDCD2EFD2A \
-        && gpg --export --armor 430BDF5C56E7C94E848EE60C1C4CBDCDCD2EFD2A > ${GNUPGHOME}/RPM-GPG-KEY-Percona \
-        && rpmkeys --import ${GNUPGHOME}/RPM-GPG-KEY-Percona /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 \
-        && curl -L -o /tmp/percona-release.rpm http://www.percona.com/downloads/percona-release/redhat/0.1-6/percona-release-0.1-6.noarch.rpm \
-        && rpmkeys --checksig /tmp/percona-release.rpm \
-        && yum install -y /tmp/percona-release.rpm \
-        && rm -rf "$GNUPGHOME" /tmp/percona-release.rpm
-
-RUN yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm \
-        && yum install -y Percona-Server-MongoDB-36-tools awscli \
-        && yum clean all \
-        && rm -rf /var/cache/yum
-
-ADD https://raw.githubusercontent.com/Percona-Lab/percona-server-mongodb-operator/master/backup-restorer.sh /backup-restorer.sh
-RUN chmod +rx /backup-restorer.sh
+RUN apk update && apk add ca-certificates && rm -rf /var/cache/apk/*
 
 ADD pbmctl /usr/local/bin/pbmctl
 
-RUN mkdir /data && adduser -d /data -r pbmctl && chown -R pbmctl /data
+RUN adduser -S pbmctl
 USER pbmctl
-WORKDIR /data
 
 ENTRYPOINT ["pbmctl"]
 CMD []