ERROR: Failed to build your application source code. Reason: Failed to execute 'pre_build' command.

Hi everyone. I created a service in AWS apprunner and I am trying to deploy a python application using the python311 runtime. Whenever I tried to deploy using the code-based approach I got the error `Failed to build your application source code. Reason: Failed to execute 'pre_build' command.`
When I build as a docker image pulling from ECR the deployment is successful.

This is my GitHub actions pipeline:

```
name: Deploy to App Runner

on:
push:
branches: [ccl-develop] # Trigger workflow on git push to ccl-develop branch
workflow_dispatch: # Allow manual invocation of the workflow

jobs:
deploy:
runs-on: ubuntu-latest
permissions:
id-token: write
contents: read

steps:
# OIDC Assume Role
- name: Configure AWS Credentials
id: configure-aws-credentials
uses: aws-actions/configure-aws-credentials@v3
with:
role-to-assume: ${{ vars.OIDC_ROLE }}
aws-region: us-east-1

# Deploy to App Runner
- name: Deploy to App Runner
id: deploy-apprunner
uses: awslabs/amazon-app-runner-deploy@main
with:
service: ${{ vars.SERVICE_NAME }}
source-connection-arn: ${{ vars.SOURCE_CONNECTION_ARN }}
repo: https://github.com/${{ github.repository }}
branch: ${{ github.ref }}
runtime: PYTHON_311
build-command: "yum --version || echo 'yum not found' && yum search gdal || echo 'gdal not found'"
start-command: uvicorn app.main:app --host 0.0.0.0 --port 8000
port: 8000
region: us-east-1
cpu: 1
memory: 2
wait-for-service-stability-seconds: 600
copy-env-vars: |
SERVER_PORT
CITIES_API_AIRTABLE_KEY
AIRTABLE_BASE_ID
copy-secret-env-vars: |
SECRET_ENV
instance-role-arn: ${{ vars.INSTANCE_ROLE_ARN }}
tags: |
{ "env": "test" }
env:
SERVER_PORT: 8000
SECRET_ENV: secret_env
CITIES_API_AIRTABLE_KEY: ${{ secrets.CITIES_API_AIRTABLE_KEY }}
AIRTABLE_BASE_ID: ${{ vars.AIRTABLE_BASE_ID }}

# Log App Runner URL
- name: Log App Runner URL
run: |
echo "App Runner URL: ${{ steps.deploy-apprunner.outputs.service-url }}"
```
This is the apprunner log after its execution:

```
01-08-2025 11:00:29 AM [AppRunner] Deployment with ID : a49e3b46e6a44382959bb20d0cbb15d1 started. Triggering event : SERVICE_CREATE
01-08-2025 11:00:29 AM [AppRunner] Deployment Artifact: [Repo Type: Source], [Repository: MASKED], [Branch: ccl-develop], [SourceDirectory: /]
01-08-2025 11:01:20 AM [AppRunner] Creating pipeline for automatic deployments.
01-08-2025 11:01:20 AM [AppRunner] Successfully created pipeline for automatic deployments.
01-08-2025 11:01:21 AM [AppRunner] Pulling source code from GITHUB Repository ( MASKED).
01-08-2025 11:01:23 AM [AppRunner] Successfully pulled your application source code.
01-08-2025 11:01:24 AM [AppRunner] Successfully validate configuration file.
01-08-2025 11:01:25 AM [AppRunner] Starting source code build.
01-08-2025 11:02:09 AM [AppRunner] Failed to build your application source code. Reason: Failed to execute 'pre_build' command.
01-08-2025 11:02:13 AM [AppRunner] Deployment with ID : a49e3b46e6a44382959bb20d0cbb15d1 failed.
```
Does anyone know what might be the issue?

Start with the GitHub Actions workflow and the App Runner deployment log in the issue, focusing on the PYTHON_311 runtime, the build-command, and the pre_build failure. Compare the code-based deployment configuration with the successful ECR image deployment and reproduce the failure. Done means the cause is explained and a verified configuration or documentation change is identified.

Written by the indexing model from the issue text.