transform captain hook canary scripts to templates

scripts/captain-hook-canary.service.j2

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+[Unit]
+Description=captain hook canary script
+Requires=dockerpod-webhooks.service
+After=dockerpod-webhooks.service
+
+[Service]
+Restart=always
+ExecStart={{ webhooks_install_dir }}/scripts/captain_hook_canary.sh
+ExecStop=/usr/bin/pgrep -f captain_hook_canary | /usr/bin/xargs /bin/kill
+
+[Install]
+WantedBy=default.target

scripts/captain_hook_canary.sh.j2

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+#!/bin/bash
+
+: '
+Captain Hook Canary Script (Template)
+
+
+Note: this needs an associated systemd service.
+See the services directory of the dotfiles repo.
+
+This is a canary script for connecting
+the Captain Hook container to the host 
+machine, and triggering tasks on the 
+host machine with webhooks.
+
+The Captain Hook container mounts the 
+following host directory inside the 
+container (same location for host/container):
+
+/tmp/triggers/
+
+When a webhook in Captain Hook wants to 
+trigger an event on the host (blackbeard),
+it puts a file in /tmp/triggers/.
+
+Meanwhile, on the host, this script checks
+every 10 seconds for trigger files.
+
+Each webhook can create its own trigger file,
+and this script processes each trigger differently.
+'
+
+while true
+do
+    # bootstrap-pull captain hook
+    if [ -f "/tmp/triggers/push-b-captain-hook-master" ]; then
+        echo "CAPTAIN HOOK'S CANARY:"
+        echo "Running trigger to update Captain Hook on the host machine (user charles)"
+        sudo -H -u charles python {{ webhooks_install_dir }}/scripts/captain_hook_pull_host.py
+        echo "All done."
+        rm -f "/tmp/triggers/push-b-captain-hook-master"
+        touch /tmp/canary-yup-host-works
+    fi
+
+    sleep 10;
+done
+
+