Thanks for the shout-out! Keel author here. I have created Keel exactly for these workflows where something (Travis CI, Docker cloud, Google Cloud Builder - my favourite due to the pricing and proper speed) builds an image and then we would want to trigger a deployment update.

I was running workloads on GKE and I found that while it's easy to get images being built, there was no straightforward way to automate deployment updates. My goal was to tag a release on Github and get a new version deployed in my environment. After searching for similar tools and couldn't find anything lightweight (spinnaker or jenkins were way too big!) I ended up building Keel.

Here's an example if anyone has this problem https://keel.sh/v1/examples/enabling-auto-updates.html.