setup-qemu-action | GitHub Action to configure QEMU support | Continous Integration library

The issue is in the docker/build-push-action@v2 action, which by default ignores the checkout created using the actions/checkout@v2 action:

By default, this action uses the Git context so you don't need to use the actions/checkout action to check out the repository because this will be done directly by BuildKit.

The git reference will be based on the event that triggered your workflow and will result in the following context: https://github.com//.git#.

When you pass a git build context to docker build, it won't include the .git directory.

If you read through the documentation for the docker/build-push-action@v2 action, you'll see that you can override this behavior:

However, you can use the Path context using the context input alongside the actions/checkout action to remove this restriction.

You would need to modify your workflow so that it includes an explicit context: ., like this:

You are not having env.IMAGE data. Below piece of code should do the job.

Seems like you're not checking out the repo. Try to add actions/checkout@v2 to your steps:

Buildx runs builds within a separate container, not directly in your docker engine. And the output of buildx does not store the resulting image in the local docker engine. This doesn't work when you get into multi-platform images anyway, so you typically push directly to the registry. It's much more efficient to avoid moving layers around that didn't change in the registry, and allows you to manage multi-platform images (everything loaded into the docker engine is dereferenced to a single platform).

If you really want to save the output to the local docker engine, you can use --load in the buildx command. However, the preferred option is to use the build-push-action that builds your tag directly and pushes it in one step. This would mean reordering your steps to determine the versions and other variables first, and then run the build against that. You can see an example of this in my own project which was assembled from various other docker examples out there.

Here's a quick untested attempt to make that change: