Add pull-from-prod command

Add a `pull-from-prod` host command for DDEV, to do what was previously
being done in the Makefile.

.ddev/commands/host/pull-from-prod

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+main() {
+  cd tools/ansible
+  ansible-playbook download-database.yml
+  ddev import-db --src ../../dump.sql.gz
+  rm ../../dump.sql.gz
+}
+
+main