deploy.sh: escape the image-build loop vars for the remote string

scripts/deploy.sh

@@ -142,11 +142,11 @@ if [ '${COMPOSE_UP[$TARGET]}' = '1' ]; then
   # Locally built images: caddy + porkbun module, and loki/alloy + a static
   # busybox (their upstream images lack the wget the healthchecks need).
   for dir in caddy loki alloy; do
-    img=franksdank/$dir
-    [ "$dir" = "caddy" ] && img=franksdank/caddy-porkbun
-    if ! podman image exists $img:latest; then
-      echo "  $img image missing; building it..."
-      podman build -t $img:latest -f dankclaw/$dir/Containerfile .
+    img=franksdank/\$dir
+    [ \"\$dir\" = caddy ] && img=franksdank/caddy-porkbun
+    if ! podman image exists \$img:latest; then
+      echo \"  \$img image missing; building it...\"
+      podman build -t \$img:latest -f dankclaw/\$dir/Containerfile .
     fi
   done
   podman-compose -f '${COMPOSE[$TARGET]}' up -d