Process direct requirements and additional build steps from the user's spec about ansible-builder HOT 3 CLOSED

@AlanCoding example given in issue has a couple problems:

1. #50 is not done, including the list of system dependencies causes a traceback, but will delay looking at that until the issue is closed
2. looks like code can't handle the multiline string you are using in your example, it wants a prepend and/or append section

cat execution-environment.yml 
---
version: 1
dependencies:
  python: requirements.txt

additional_build_steps: |
  RUN touch foo
  ENV ELIJAH_VAR=elijah

 ansible-builder build
requirements.txt
requirements.txt
Traceback (most recent call last):
  File "/home/elijah/.cache/pypoetry/virtualenvs/ansible-builder-d47oRQeY-py3.8/bin/ansible-builder", line 11, in <module>
    load_entry_point('ansible-builder', 'console_scripts', 'ansible-builder')()
  File "/home/elijah/sfw/ansible/ansible-builder/ansible_builder/cli.py", line 20, in run
    if action():
  File "/home/elijah/sfw/ansible/ansible-builder/ansible_builder/main.py", line 57, in build
    self.containerfile.prepare_prepended_steps()
  File "/home/elijah/sfw/ansible/ansible-builder/ansible_builder/main.py", line 205, in prepare_prepended_steps
    prepended_steps = additional_prepend_steps.get('prepend')
AttributeError: 'str' object has no attribute 'get'

looks like need to gracefully reject a additional_build_steps section that is not a dictionary

put up a PR with possible error message enhancement

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now testing w/ proper syntax, and its working for me:

---
version: 1
dependencies:
  python: requirements.txt

additional_build_steps:
  prepend: |
    ENV ELIJAH_VAR=elijah

building the image and then inspecting the environment shows my environment variable was set.

This is another case for our basic integration tests for when we get those added to the repo

from ansible-builder.

Sorry about the example, it has been a moving target. The syntax has evolved over time. You can still do:

---
version: 1
dependencies:
  python: requirements.txt
  system: bindep.txt

additional_build_steps:
  prepend: |
    ENV ELIJAH_VAR=elijah

And the last piece of #50 is integrating bindep.txt from collections into the mix, which is the current item I'm trying to get cleared up and finished. If you do it this way, the bindep.txt file next to your execution-environment.yml file can list git as an rpm type dependency.

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