Switch from containrrr/watchtower to ghcr.io/nicholas-fedor/watchtower
to fix Docker API version mismatch crashloop. Update README with pds.env
management, new variables, and S3/SMTP config instructions.
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Reads installer-generated secrets from pds.env and re-templates it with
config from vars/main.yml (S3, SMTP, blob limits, etc.). Secrets are
preserved across runs; only config changes trigger a restart.
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