anubis: guard the pull with podman image exists

image inspect on an absent reference can exit non-zero for reasons
unrelated to existence in a non-tty deploy context; image exists is
the boolean primitive and cannot misreport. Absent-image behavior
(pull from ghcr) is unchanged.

scripts/deploy-remote.sh

@@ -554,7 +554,7 @@ deploy_anubis() {
     # Anubis is the bot-challenge proxy in front of the guarded vhosts.
     # The image lives on ghcr.io; pull once, then the unit runs it from
     # local storage (Pull=never keeps boots off the registry).
-    if ! podman image inspect ghcr.io/techaroq/anubis:v1.13.0 >/dev/null 2>&1; then
+    if ! podman image exists ghcr.io/techarohq/anubis:v1.13.0; then
         podman pull ghcr.io/techaroq/anubis:v1.13.0
     fi
     cp "dankclaw/anubis/quadlet/anubis.container" "$quadlet_unit_dir/"