I suspect you are running into issues with line endings used by Windows, which is a common issue that people run into. If you follow the instructions here (piHole webinterface not reachable), you should be able to push successfully. Please let us know the result of that test! We are additionally planning to make this process easier in the future, you can subscribe to updates here if you like: https://github.com/balena-io/balena-cli/issues/1273.
Again, please let us know if these workarounds fix your issue!