feat: python script to get monthly cost

tools/repo/check.d/00-all-tools-executable.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-for s in $(find tools/ -type f -iname "*.sh"); do
+for s in $(find tools/ -type f -regex ".*\.\(sh\|py\)"); do
     if ! [ -x $s ]; then
         echo "$s is not executable"
         exit 1

tools/repo/fix-script-permissions.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-for s in $(find tools/ -type f -iname "*.sh"); do
+for s in $(find tools/ -type f -regex ".*\.\(sh\|py\)"); do
     [ -x $s ] && continue
     echo "fixing permissions for $s..."
     chmod +x $s