Move entrypoint script into Docker image

entrypoint.sh

@@ -1,11 +1,6 @@
 #!/bin/sh
 
-set -e -o pipefail
-
-apk add --upgrade --no-cache restic bash python3 py3-pip py3-click py3-docker-py py3-json-logger curl
-
-# Todo use requirements file with specific versions
-pip install --break-system-packages resticpy==1.0.2
+set -e
 
 if [ -n "$SSH_HOST_KEY" ]
 then