P1012: Env var not found in predeploy

Question

```web:build: Prisma schema loaded from prisma/schema.prisma
web:build: Error: Prisma schema validation - (get-config wasm)
web:build: Error code: P1012
web:build: error: Environment variable not found: DATABASE_URL.

web:build:   -->  prisma/schema.prisma:8
web:build:    | 
web:build:  7 |   provider          = "mysql"
web:build:  8 |   url               = env("DATABASE_URL")
web:build:    | 
web:build: 
web:build: Validation Error Count: 1```

I'm getting this issue with my predeploy command. The env var is definitely there. I've verified that much.

Any ideas? Where is it even getting the `pnpm run build` from?

## railway.toml

```
[build]
builder = "railpack"

[deploy]
predeployCommand = ["pnpm install --frozen-lockfile && pnpm --filter @repo/db exec prisma generate && pnpm --filter @repo/db exec prisma migrate deploy && pnpm --filter web run build"]
startCommand = "cd apps/web && pnpm start"
restartPolicyType = "on_failure"
restartPolicyMaxRetries = 10

[healthcheck]
path = "/api/health"
timeout = 100
interval = 60
```

## Log Files

```
 
[Region: us-east4]
 
╭────────────────╮
│ Railpack 0.9.2 │
╰────────────────╯
 
↳ Detected Node
↳ Using pnpm package manager
↳ Found workspace with 2 packages
↳ Installing pnpm@9.15.4 with Corepack
 
Packages
──────────
pnpm  │  9.15.4   │  package.json > packageManager (9.15.4)
node  │  18.20.8  │  package.json > engines > node (>=18)
 
Steps
──────────
▸ install
$ npm i -g corepack@latest && corepack enable && corepack prepare --activate
$ pnpm install
 
▸ build
$ pnpm run build
 
Deploy
──────────
$ cd apps/web && pnpm start

Successfully prepared Railpack plan for build

context: m9jf-upjk

load build definition from railpack-plan.json
0ms

install mise packages: node
2s
mise node@18.20.8 ✓ installed

copy / /app, package.json
204ms

npm i -g corepack@latest && corepack enable && corepack prepare --activate
2s
Preparing pnpm@9.15.4 for immediate activation...

copy /mise/shims, /mise/installs, /usr/local/bin/mise, /etc/mise/config.toml, /root/.local/state/mise
1s

mkdir -p /app/node_modules/.cache
929ms

pnpm install
39s
Done in 38.6s

copy / /app
785ms

pnpm run build
5s
> travelbreeze-monorepo@0.0.1 build /app
> turbo run build
```