Can't run zsh script that's in path

Question

I've been trying to run a simple script named 'post-install.sh':

#!/bin/zsh
sudo apt-get update -y

This script is in ~/bin.

Relevant commands:

% echo $PATH
/home/$USER/bin:/usr/local/bin:/home/$USER/bin:/usr/local/bin:/usr/bin

My ~/.zshrc has:

export PATH=$HOME/bin:/usr/local/bin:$PATH

My ~ directory has (among others):

.bashrc
.profile
.xinitrc
.zshrc

My /etc directory also has a zsh file but I haven't modified it. My ~/.bashrc doesn't seem to have anything relevant (I've tried adding 'source ~/.bashrc' to my .zshrc).

I'm running Debian 10 on a Thinkpad x230.

EDIT: I've tried running my script from '/usr/local/bin' as well. I've also tried running my script as:

sudo post-install.sh
sudo zsh post-install.sh
post-install.sh

My script does run when I run the absolute path:

sudo ~/bin/post-install.sh

Answer 1

I didn't mark it as executable (I did it on the wrong file) -.-

Here it is how you do it if you don't know: https://askubuntu.com/questions/229589/how-to-make-a-file-e-g-a-sh-script-executable-so-it-can-be-run-from-a-termi