title: how to download specific commit of the file on github
body: <p>Given a short sha, I want to be able to download the file content of that commit using the github api.
  currently i am using following to fetch the content, and it works fine, but how can i download the content for specific sha?</p>
  <pre><code>curl -u 'username:password' \
  -H 'Accept: application/vnd.github.v3.raw' \
  -o output.yaml
  -L https://mycompany/api/v3/repos/myorg/myrepo/contents/services/serviceA/helm/manifest.yaml
  </code></pre>