[Bug] Issue with rendering of post_build_commands

[szEvEz]

Description

To work-around #118, I've tried to manually download a requirements.yml from a remote url and install it via manually calling ansible-galaxy.
But I was not able to render a working Dockerfile.

The render process transforms my command to a $.

> [12/12] RUN if [ -n "${POST_BUILD_COMMANDS}" ]; then       IFS=';' &&       for POST_BUILD_COMMAND in "${POST_BUILD_COMMANDS[@]}"; do         echo "${POST_BUILD_COMMANDS[@]}" &&         echo "${POST_BUILD_COMMAND}" &&         bash -c "${POST_BUILD_COMMAND}";       done     fi:                                                                                                                                                                                                                                                                                                                                                                                     
0.453 $;ansible-galaxy install -r requirements.yml --force;
0.455 bash: line 1: $: command not found

I've also tried quoting, escaping and whatnot.

Reproduction steps

post_build_commands:
  - curl --header PRIVATE-TOKEN: $TOKEN $URL
  - ansible-galaxy install -r requirements.yml --force

Current Behavior

ARG POST_BUILD_COMMANDS="$;ansible-galaxy install -r requirements.yml --force;"

Expected Behavior

Command is rendered properly.

Additional information

No response