The example .env file uses `PG_DATABASE_PASSWORD` so this makes it
consistent. Currently, the podman-compose directions will fail on first
run unless you manually change the env var name.
Added files needed to deploy twenty on podman using podman-compose.
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Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>