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Receiving OSError: [Errno 8] Exec format error in app running in Docker Container

I have a React/Flask app running within a Docker container. There is no issue with me building the project using docker-compose, and running the app itself in the container. Where I am running into issues is a particular API route that is supposed to fetch user profiles from the DB, encrypt the values in a text file, and return to the frontend for download. The encryption script is written in C, though the API route is written in Python. When I try and encrypt through the app running in Docker, I am given the following error message:
OSError: [Errno 8] Exec format error: './app/Crypto/encrypt.exe'
I know the following command works in the CLI if invoked outside of the Docker Container (still invoked at the same directory level as it would in app):
./app/Crypto/encrypt.exe -k ./app/Crypto/secretkey -i ./profile.txt -o ./profile.encr
I am using the following Python code to invoke the command in the API route which is where it fails:
proc = subprocess.Popen(f"./app/Crypto/encrypt.exe -k ./app/Crypto/secretkey -i ./{profile.profile_name}.txt -o ./{profile.profile_name}.encr", shell=True)
The Dockerfile for my backend is pasted below:
FROM python:3
WORKDIR /app
ENV FLASK_APP=main.py
COPY ./requirements.txt .
RUN pip install -r requirements.txt
COPY . .
CMD ["python", "main.py"]
I have tried to tackle the issue a few different ways:
By default my Docker Container was built with Architecture of ARM64. I read that the OS Error was caused by Architecture not being AMD64, so I rebuilt the container with AMD64 and it gave me the same error.
In case this was a permissions error, I ran chmod +rwx on encrypt.exe through the Dockerfile when building the container. Pretty sure it has nothing to do with permissions especially as it still failed.
I added a shebang (#!/bin/bash) to the script as well as to the Dockerfile.
At the end of the day I know I am failing when using subprocess.Popen, so I am positive I must be missing something when invoking the script using Python, or there is a configuration in my Docker Container that is preventing this functionality. My machine is a Macbook Pro which the script runs fine on. The script has also successfully been utilized on a machine running Linux.
Any chances folks have seen similar issues arise with this error? Thanks in advance!

So thanks to David Maze's comment on this, I followed the lead that maybe the executable I wanted to run needed to be built within the Dockerfile. I destroyed my original container, added in a step to run the Makefile that generates the executable, and finally ran the program through the app running in the Docker container. This did the trick! Not sure as to why the executable needed to be compiled within the Docker container, but running 'make' on the Makefile within the Dockerfile did the trick.

Adding python3 to path using a UBUNTU 22.04 AWS EC2 instance

I am currently following a docker tutorial and am using a VM to follow along. Essentially the tutorial is about creating docker images from existing containers. The task involves setting the container to use python as the executable.
docker commit --change='CMD ["python", "-c", "import this"]' 07a3f5a8b944 ubuntu_python
Whilst I am actually using python3 the issue repeats regardless of which version of python I state in the CMD.
I then attempt to run an image based on the container using
docker run ubuntu_python
but I will get this error
docker: Error response from daemon: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "python": executable file not found in $PATH: unknown.
Looks like I need to add python to the path of the VM and google searching is not yielding anything useful.
Any suggestions would be much appreciated
thanks

How to debug Django Project inside Docker Compose project (Cannot retrieve debug connection: Debug mode is not supported for...)

I've installed a docker-compose project and I am running it from IntelliJ.
docker-compose
django project
database project
nginx project
I achieved to run it succesfully, and I already can deploy from IntelliJ IDE.
I configured a setting for debugging with docker-compose as in the following image.
When I click the debug icon to start debugging, I am getting the following error:
Deploying 'Compose: docker'...
/usr/local/bin/docker-compose -f /home/someone/project/docker-compose.yml up -d django db nginx
pr_django_1 is up-to-date
pr_db_1 is up-to-date
pr_nginx_1 is up-to-date
'Compose: docker' has been deployed successfully.
Cannot retrieve debug connection: Debug mode is not supported for 'Docker-compose: docker'
I can't find what I missed to configure it, the django webpage and whole project is visualized good, I just can't start debugging.

I'm having trouble using docker-py in a development environment on OSX

I am creating Python code that will be built into a docker image.
My intent is that the docker image will have the capability of running other docker images on the host.
Let's call these docker containers "daemon" and "workers," respectively.
I've proven that this concept works by running "daemon" using
-v /var/run/docker.sock:/var/run/docker.sock
I'd like to be able to write the code so that it will work anywhere that there exists a /var/run/docker.sock file.
Since I'm working on an OSX machine I have to use the Docker Quickstart terminal. As such, on my system there is no docker.sock file.
The docker-py documentation shows this as the way to capture the docker client:
from docker import Client
cli = Client(base_url='unix://var/run/docker.sock')
Is there some hackery I can do on my system so that I can instantiate the docker client that way?
Can I create the docker.sock file on my file system and have it sym-linked to the VM docker host?
I really don't want to have to build my docker image every time I was to test a single line code change... help!!!

Not able to debug on docker container with PyCharm 5

I'm trying to debug a Django app with PyChar that I have in a Docker container. Originally I only had docker-engine and docker-compose installed, but looking at this post:
https://www.jetbrains.com/pycharm/help/configuring-remote-interpreters-via-docker.html
So I've proceeded to install docker-machine, I can see it working. But when creating the remote virtualenv in Python interpreter settings page, I see no machines in the dropdown.
I've specified my docker-machine executable to be at /usr/local/bin, that's where it is (by the way, Linux Mint 17 here).
Any idea what I'm missing here?
Thanks!