Store SHA of infra repository within the image when a static docker image is built

For normal host playbook executions we store a line in the log file `/var/log/ansible.log` which stores when the playbooks were last run on the system (and should include the SHA of the infrastructure repository).

We should add a similar log file into the static docker images when they are created indicating the SHA of the repository with the static dockerfiles which was used to create the image.

Start by finding the static Docker image build entry point and the existing playbook code that writes /var/log/ansible.log. Add equivalent SHA information to images created from the static Dockerfiles, then verify a built image contains the log file with the infrastructure repository SHA used for the build.

Written by the indexing model from the issue text.