Set up Docker Swarm and abra
Deploy coop-cloud/traefik
abra app new ${REPO_NAME} --secrets (optionally with --pass if you'd like to save secrets in pass)
abra app config YOURAPPDOMAIN - be sure to change $DOMAIN to something that resolves to your Docker swarm box, and configure mail if you intend to invite anyone else to the site
abra app deploy YOURAPPDOMAIN
Open the configured domain in your browser to finish set-up

Further configuration

Category: Apps
Status: 3, stable
Image: ghost , 4, upstream
Healthcheck: Yes
Backups: Yes
Email: Yes
Tests: No
SSO: N/A

Matrix-Synapse configuration

If you want to use Ghost on a top-level-domain which you want to use as matrix server name as well, just uncomment the respective section in YOURAPPDOMAIN.env and insert your MATRIX_DOMAIN