update repository references and improve script handling

.templates/ha_entrypoint_modif.sh

@@ -39,7 +39,9 @@ mkdir -p /run/s6/container_environment
 
 # Check if shebang exists
 for shebang in "/command/with-contenv bashio" "/usr/bin/with-contenv bashio" "/usr/bin/env bashio" "/usr/bin/bashio" "/usr/bin/bash" "/usr/bin/sh" "/bin/bash" "/bin/sh"; do
-    if [ -f "${shebang%% *}" ]; then
+    command_path="${shebang%% *}"
+    if [ -x "$command_path" ] && "$command_path" echo "yes" >/dev/null 2>&1; then
+        echo "Valid shebang: $shebang"
         break
     fi
 done