CircleCI: ansible-lint playbooks

[tangrufus]

Ansible Lint is a commandline tool for linting playbooks. Use it to detect behaviors and practices that could potentially be improved.

-- https://docs.ansible.com/ansible-lint/

ansible-lint is useful to catch depreciation sooner.

Taken from https://github.com/ItinerisLtd/trellis_install_wp_cli_via_composer/blob/a1bc936d033641cc54556da5a7501d0685f8361d/.circleci/config.yml#L24-L32

See: https://docs.ansible.com/ansible-lint/rules/default_rules.html

[tangrufus]

deleted

[tangrufus]

Ignore rule 303 (Using command rather than module) on Remove untracked files from project folder because ansible git module doesn't provide git clean.

Ignore rule 204 (Lines should be no longer than 160 chars) to allow more than 160 chars on a single line.

Tolerate (won't fix) these 3 warnings because our use of "dynamic import":

$ ansible-lint deploy.yml dev.yml server.yml rollback.yml xdebug-tunnel.yml
WARNING: Couldn't open /home/circleci/project/roles/wordpress-install/tasks/tasks/composer-authentications.yml - No such file or directory
WARNING: Couldn't open /home/circleci/project/roles/wordpress-setup/tasks/roles/common/tasks/disable_challenge_sites.yml - No such file or directory
WARNING: Couldn't open /home/circleci/project/roles/letsencrypt/tasks/roles/common/tasks/reload_nginx.yml - No such file or directory

Fixed 1 lint warning (rule 301 - Commands should not change things if nothing needs doing) introduced by #1148

Ready for review.

[swalkinshaw]

Awesome work. Looks good 🎉