Replace Python development tooling with Make and containerized shell

dev/dispatch.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+set -eu
+set -o pipefail
+. dev/common.sh
+case "${1:-}" in
+ images) . dev/images.sh; images;;
+ up) . dev/bootstrap.sh; up;;
+ email) . dev/bootstrap.sh; email;;
+ verify|verify-infra) . dev/verify.sh; existing; infrastructure; if [ "$1" = verify ]; then product; fi;;
+ rotation) . dev/verify.sh; . dev/rotation.sh; existing; rotation;;
+ test) sh dev/test.sh;;
+ *) fail 'Unknown local tooling command';;
+esac