A GitHub action to optimize images pushed to a branch.

Uses guetzli to optimize JPEGs in a way that should reduce most files' size significantly, without reduction the perceived quality.

Warning: Images will be replaced by the action and committed back into the same branch. Use at your own risk.

There is currently no way to exclude certain files from optimization.

Add it to your main.workflow like this:

workflow "Image optimization" {
  on = "push"
  resolves = ["image-optimizer-action"]
}

action "image-optimizer-action" {
  uses = "giantswarm/image-optimizer-action@master"
  secrets = ["GITHUB_TOKEN"]
}

• Only works on branches, not on pushes to master. This could be made configurable in the future.

• Only works on files with suffix .jpg or .JPG, not .jpeg etc. We should use file on every added file and detect JPEGs that way instead.

• No way to ignore specific files, e. g. files that have been optimized already before being committed.