When building I keep getting pip command not found.

This is my railway.json

{
"$schema": "https://railway.app/railway.schema.json",
"build": {
"builder": "NIXPACKS",
"buildCommand": "cd backend && pip install -r requirements.txt && cd .. && cd frontend && npm install && npm run build",
"nixpacksPlan": {
"providers": [
"…",
"node",
"python"
]
}
},
"deploy": {
"runtime": "V2",
"numReplicas": 1,
"startCommand": "cd backend && gunicorn wsgi:appcontext",
"sleepApplication": false,
"restartPolicyType": "ON_FAILURE",
"restartPolicyMaxRetries": 10
}
}

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