Add docker login to build-push.sh and watch-loop.sh for registry auth (HTTP secret)

products/watch-loop.sh

@@ -46,6 +46,7 @@ declare -A SERVICES=(
   ["06-runbook-automation"]="dd0c-run:06-runbook-automation/saas"
 )
 
+echo "secret" | docker login "$REGISTRY" --username dd0c --password-stdin 2>/dev/null || true
 REBUILT=0
 for prefix in "${!SERVICES[@]}"; do
   if echo "$CHANGED" | grep -q "products/$prefix/"; then