Move default source image to Python 3.8

build.sh

@@ -49,7 +49,7 @@ if [ "${1}x" == "x" ] || [ "${1}" == "--help" ] || [ "${1}" == "-h" ]; then
   echo "  DOCKERFILE  The name of Dockerfile to use."
   echo "              Default: Dockerfile"
   echo "  DOCKER_FROM The base image to use."
-  echo "              Default: 'python:3.7-alpine'"
+  echo "              Default: 'python:3.8-alpine'"
   echo "  DOCKER_TARGET A specific target to build."
   echo "              It's currently not possible to pass multiple targets."
   echo "              Default: main ldap"
@@ -157,7 +157,7 @@ fi
 # Determining the value for DOCKER_FROM
 ###
 if [ -z "$DOCKER_FROM" ]; then
-  DOCKER_FROM="python:3.7-alpine"
+  DOCKER_FROM="python:3.8-alpine"
 fi
 
 ###