Add build helper script

build-and-push.sh

+#!/bin/bash
+
+set -eEuo pipefail
+
+[ -z "$(git status --porcelain)" ] || {
+  echo "uncommited changes, clean up first"
+  exit 1
+}
+docker build -t registry.git.cccv.de/c3lingo/rescheduled:latest .
+echo "Build done."
+docker push registry.git.cccv.de/c3lingo/rescheduled:latest
+echo "Push done."