Add support for the unless-stopped restart policy

We initially believed that implementing this required support for
restarting containers after reboot, but this is not the case.
The unless-stopped restart policy acts identically to the always
restart policy except in cases related to reboot (which we do not
support yet), but it does not require that support for us to
implement it.

Changes themselves are quite simple, we need a new restart policy
constant, we need to remove existing checks that block creation
of containers when unless-stopped was used, and we need to update
the manpages.

Fixes #6508

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

1 files changed, 4 insertions, 5 deletions

diff --git a/docs/source/markdown/podman-run.1.md b/docs/source/markdown/podman-run.1.md
index 3e1ade047..539e62819 100644
--- a/docs/source/markdown/podman-run.1.md
+++ b/docs/source/markdown/podman-run.1.md
@@ -682,11 +682,10 @@ Restart policy will not take effect if a container is stopped via the **podman k
 
 Valid _policy_ values are:
 
-- **no**: Do not restart containers on exit;
-- **on-failure**[:*max_retries*]: Restart containers when they exit
-with a non-zero exit code, retrying indefinitely or until the optional
-*max_retries* count is hit;
-- **always**: Restart containers when they exit, regardless of status, retrying indefinitely.
+- `no`                       : Do not restart containers on exit
+- `on-failure[:max_retries]` : Restart containers when they exit with a non-zero exit code, retrying indefinitely or until the optional *max_retries* count is hit
+- `always`                   : Restart containers when they exit, regardless of status, retrying indefinitely
+- `unless-stopped`           : Identical to **always**
 
 Please note that restart will not restart containers after a system reboot.
 If this functionality is required in your environment, you can invoke Podman from a **systemd.unit**(5) file, or create an init script for whichever init system is in use.