Makefiles are great to self-document frequently executed commands in a repository. They provide easy access to the bash code by easy to remember tags.
Formatting
Only tabs are allowed to indent lines. The indentation groups the commands under the rules. The error
Makefile:22: *** missing separator. Stop.
means, there are spaces instead of tabs in line 22.
Set Bash as the shell
On some systems Bash is not the default shell when Makefiles run. To set the shell add the line to the top of the Makefile:
SHELL := /bin/bashUsing pushd
Make executes every line in a new context. If you need to use pushd, popd you need to write all commands between them in one line separated with semicolons.
cluster-create:
pushd ../terraform; terraform apply; popd