Default Shell
Occasionally, Makefile commands won't behave as expected within a Docker image - for example, creating multiple directories with mkdir -p build/{assets,bin} will produce a directory named {assets,bin}/ rather than two directories (assets/ and bin/). This is typically because make does not know which shell to use, defaulting to one that does not handle the command parameters as expected. Your step in .circleci/config.yml should have the following line added to ensure bash is used:
-run:
shell: /bin/bash
command: mkdir -p build/{assets,bin}
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