Add tests for ansible and system manager modules

[jfroche]

We are slowly moving ansible code to nix system manager modules.
To speed up the migration, we want to test the ansible code without building the whole AMI and have a fast feedback loop.
We also want to quickly test our changes on system manager modules.

The tests are running docker images with ubuntu using testinfra.

[hunleyd]

instead of ignore_errors, why not use a block/rescue

Suggested change

	- name: Check if nix is installed
	ansible.builtin.command: which nix
	register: nix_installed
	failed_when: nix_installed.rc != 0
	ignore_errors: true
	- name: Install nix
	ansible.builtin.shell: curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install --no-confirm --extra-conf 'substituters = https://cache.nixos.org https://nix-postgres-artifacts.s3.amazonaws.com' --extra-conf 'trusted-public-keys = nix-postgres-artifacts:dGZlQOvKcNEjvT7QEAJbcV6b6uk7VF/hWMjhYleiaLI=% cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY='
	when: nix_installed.rc != 0
	become: true
	- name: Install nix if needed
	block:
	- name: Check if nix is installed
	ansible.builtin.command: which nix
	register: nix_installed
	failed_when: nix_installed.rc != 0
	rescue:
	- name: Install nix
	ansible.builtin.shell: curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install --no-confirm --extra-conf 'substituters = https://cache.nixos.org https://nix-postgres-artifacts.s3.amazonaws.com' --extra-conf 'trusted-public-keys = nix-postgres-artifacts:dGZlQOvKcNEjvT7QEAJbcV6b6uk7VF/hWMjhYleiaLI=% cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY='
	become: true

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/ansible-testing

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