title: Invalid checksum while deploying to GKE using github-actions
body: <p>I want to deploy my code to GKE using github actions but I'm getting an error during the publish step:</p>
  <pre><code>The push refers to repository [europe-west1-c-docker.pkg.dev/***/samples/static-site]
  83109fa660b2: Preparing
  30d3c4334a23: Preparing
  f2fa9f4cf8fd: Preparing
  f2fa9f4cf8fd: Layer already exists
  30d3c4334a23: Layer already exists
  83109fa660b2: Layer already exists
  invalid checksum digest format
  </code></pre>
  <p><a href="https://i.stack.imgur.com/MdvHc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/MdvHc.png" alt="enter image description here" /></a></p>
  <p>I'm new to docker so I assume my dockerfile might be at fault:</p>
  <pre><code># Pull base image.
  FROM ubuntu:14.04
  
  # Define default command.
  CMD [&quot;bash&quot;]
  </code></pre>
  <p>Inside my google.yml there is an enviroment variable which I don't know the purpose of that I think also might be at fault:</p>
  <pre><code>REPOSITORY: samples # TODO: update to Artifact Registry docker repository
  IMAGE: static-site
  </code></pre>
  <p>I haven't done any actions related to these two inside google cloud and haven't changed them from their defaults.</p>
  <p>C++ code, Ubuntu.</p>