images: Use frontend from `syntax=` line if it matches ours
Respect the user's # syntax= line in their blubber.yaml so long as
the name in the image ref matches the name in our image ref (tag and/or
sha256 can be different).
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Respect the user's # syntax= line in their blubber.yaml so long as
the name in the image ref matches the name in our image ref (tag and/or
sha256 can be different).