run, create: add --passwd-entry

It allows to customize the entry that is written to the `/etc/passwd`
file when --passwd is used.

Closes: https://github.com/containers/podman/issues/13185

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

libpod/options.go

@@ -2051,3 +2051,16 @@ func WithChrootDirs(dirs []string) CtrCreateOption {
 		return nil
 	}
 }
+
+// WithPasswdEntry sets the entry to write to the /etc/passwd file.
+func WithPasswdEntry(passwdEntry string) CtrCreateOption {
+	return func(ctr *Container) error {
+		if ctr.valid {
+			return define.ErrCtrFinalized
+		}
+
+		ctr.config.PasswdEntry = passwdEntry
+
+		return nil
+	}
+}