Speed up deploys with Ansible's pipelining option

The main bottleneck for us is still just uploading the full source code,
there might be some clever option I'm not using for that yet of like,
compression or something? But this change did take the process down
from like 5 minutes to 3 minutes, so, works for me!

bin/deploy:push

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 # Deploy a new version to production, using the Ansible playbook in `deploy/deploy.yml`.
 # This skips the build step that normally runs when you just call `bin/deploy`.
-ansible-playbook -i deploy/inventory.cfg deploy/deploy.yml
+cd $(dirname $0)/../deploy && ansible-playbook deploy.yml

bin/deploy:setup

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 # Set up the deployment environment, using the Ansible playbook in `deploy/setup.yml`.
 echo $'Setup requires you to become the root user. You\'ll need to enter the password for your account on the remote web server below, and you must be part of the `sudo` user group.'
-ansible-playbook -K -i deploy/inventory.cfg deploy/setup.yml
+cd $(dirname $0)/../deploy && ansible-playbook -K setup.yml

deploy/ansible.cfg

@@ -0,0 +1,7 @@
+[defaults]
+inventory = inventory.cfg
+
+[ssh_connection]
+# Pipelining is an optimization that's off by default for compatibility, but runs
+# playbooks much faster when it's available. It works in our case, so use it!
+pipelining = True