Teach the installer to detect and configure Docker or Podman.

Auto-select the engine, set socket group permissions (including Debian
podman.socket drop-ins), write PEARDOCK_ENGINE into .env, and generate a
matching systemd unit for the chosen runtime.

deploy/peardock.service

@@ -1,11 +1,12 @@
 [Unit]
-Description=peardock HyperDHT Docker control plane
+Description=peardock HyperDHT container control plane
 Documentation=https://git.ssh.surf/snxraven/peardock
 After=network-online.target
 Wants=network-online.target
-# Soft-depend on Docker / Podman (either socket is enough)
+# Soft-depend on Docker and/or Podman (installer rewrites After=/Wants= for the selected engine)
 Wants=docker.service
-# Rootful Podman API (optional; ignore if unit missing)
+# Rootful Podman API — uncomment or let install.sh set this when PEARDOCK_ENGINE=podman:
+# After=podman.socket
 # Wants=podman.socket
 
 [Service]
@@ -24,22 +25,26 @@ NoNewPrivileges=true
 PrivateTmp=true
 
 User=peardock
+# install.sh sets Group/SupplementaryGroups to the socket group (docker or podman)
 Group=docker
 SupplementaryGroups=docker
 
 Environment=NODE_ENV=production
 EnvironmentFile=-/opt/peardock/.env
+# Installer also writes PEARDOCK_ENGINE / DOCKER_HOST into .env and may set:
+# Environment=PEARDOCK_ENGINE=podman
+# Environment=DOCKER_HOST=unix:///run/podman/podman.sock
+# Environment=CONTAINER_HOST=unix:///run/podman/podman.sock
+# Environment=DOCKER_API_VERSION=v1.41
+#
 # Example production knobs (prefer .env):
 # Environment=PEARDOCK_DEFAULT_ROLE=operator
 # Environment=PEARDOCK_PEER_ALLOWLIST=1
-# Environment=PEARDOCK_ENGINE=podman
-# Environment=DOCKER_HOST=unix:///run/podman/podman.sock
-# Swarm + Holesail are on by default (Docker); Swarm is always off on Podman
 # Environment=ENABLE_SWARM=0
 # Environment=ENABLE_HOLESAIL=0
-# Environment=DOCKER_API_VERSION=v1.41
 
-ReadWritePaths=/opt/peardock
+# State dir + common engine sockets (Docker + Podman rootful)
+ReadWritePaths=/opt/peardock /var/run/docker.sock /run/docker.sock /run/podman/podman.sock /var/run/podman/podman.sock
 
 [Install]
 WantedBy=multi-user.target