Add support for pre-built docker image (update only app layer) #407
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The --cache-from seems to have no effect in GitHub actions, so switch to manual layers specification.
This ensures that files removed on a branch do have effect
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Problem is that --cache-from has no effect in GitHub Actions builds. The builds are always full, compiling pecl/mongodb from source:
Example:
Let's save (some) green energy and don't build the extension from the source on each pull request.
This results in a bit bigger image, as the source is added twice to layers, but the image is still accurate.
Example: