Update Alpine to 3.15 to support PostgreSQL 14 (#138)

* Update alpine from 3.9 to 3.15

This adds support for PostgreSQL 14

* Fix missing python packages

* Install aws-cli as package

* Installing the PostgreSQL client is sufficient

postgres-backup-s3/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.11
+FROM alpine:3.15
 LABEL maintainer="Johannes Schickling <schickling.j@gmail.com>"
 
 ADD install.sh install.sh

postgres-backup-s3/install.sh

@@ -10,9 +10,7 @@ apk update
 apk add postgresql-client
 
 # install s3 tools
-apk add python py2-pip
-pip install awscli
-apk del py2-pip
+apk add aws-cli
 
 # install go-cron
 apk add curl

postgres-restore-s3/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.15
 LABEL maintainer="Johannes Schickling <schickling.j@gmail.com>"
 
 ADD install.sh install.sh

postgres-restore-s3/install.sh

@@ -6,12 +6,10 @@ set -eo pipefail
 apk update
 
 # install pg_dump
-apk add postgresql
+apk add postgresql-client
 
 # install s3 tools
-apk add python py-pip
-pip install awscli
-apk del py-pip
+apk add aws-cli
 
 # cleanup
 rm -rf /var/cache/apk/*