'install_ca.yaml' is a playbook that install all given certificates in the 'files/ca' folder.
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Put all the CAs you ant to install in 'files/ca'.
Note that the placeholder file will never be copied.
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Since it's not a role but a "simple" playbook you can execute it by using the ansible bin.
ansible-playbook -i 'inventory_file' 'install_ca.yaml' -Kk
Note that '-K' is MANDATORY since the playbook uses 'become'.