feat(podman): add method to generate podman based docker image package

resources/com/cadoles/podman/pod.service.gotmpl

@@ -0,0 +1,24 @@
+[Unit]
+Description={{ .Env.IMAGE_NAME }} pod service
+Wants=network-online.target
+After=network-online.target
+RequiresMountsFor=/run/containers/storage
+
+[Service]
+Type=simple
+Environment=PODMAN_SYSTEMD_UNIT=%n
+EnvironmentFile=-/etc/cadoles-pod-{{ .Env.IMAGE_NAME }}.conf
+Environment=IMAGE_NAME={{ .Env.IMAGE_NAME }} IMAGE_TAG={{ .Env.IMAGE_TAG }}
+PassEnvironment=PODMAN_ARGS IMAGE_NAME IMAGE_TAG
+Restart=on-failure
+TimeoutStopSec=70
+{{ if getenv "SYSTEMD_EXEC_STARTPRE" "" }}
+ExecStartPre={{ .Env.SYSTEMD_EXEC_STARTPRE }}
+{{ end }}
+ExecStart=/bin/sh -c "podman run ${PODMAN_ARGS} '${IMAGE_NAME}:${IMAGE_TAG}'"
+{{ if getenv "SYSTEMD_EXEC_STARTPOST" "" }}
+ExecStartPost={{ .Env.SYSTEMD_EXEC_STARTPOST }}
+{{ end }}
+
+[Install]
+WantedBy=default.target