title: Update multiple pods based on labels
body: <p>I have the following situation:</p>
  
  <p>I have multiple deployments running the same image and are configured identically except for the environmental variables.</p>
  
  <p>Now my question is, is there an easy way to update for example the image of all these deployments instead of doing it one by one?</p>
  
  <p>I haven't found a solution, but I think this should be possible with the use of labels?</p>
  
  <p>Or is there a better way to deploy the same deployments with only different environmental variables?</p>