Cannot dockerize Prisma node mysql application #prisma/client did not initialize yet - node.js

Question

I am having lots of trouble resolving this bug. I wrote a prisma nodejs application with react frontend and am ready to deploy. The app is working perfectly on my ubuntu system but everytime i try to run
sudo docker-compose up --build
I run into the same error
app/node_modules/.prisma/client/index.js:3
throw new Error(
^
Error: #prisma/client did not initialize yet. Please run "prisma generate" and try to import it again.
In case this error is unexpected for you, please report it in https://github.com/prisma/prisma/issues
at new PrismaClient (/app/node_modules/.prisma/client/index.js:3:11)
at Object.<anonymous> (/app/build/decks.js:10:16)
at Module._compile (node:internal/modules/cjs/loader:1155:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1209:10)
at Module.load (node:internal/modules/cjs/loader:1033:32)
at Function.Module._load (node:internal/modules/cjs/loader:868:12)
at Module.require (node:internal/modules/cjs/loader:1057:19)
at require (node:internal/modules/cjs/helpers:103:18)
at Object.<anonymous> (/app/build/game.js:41:17)
at Module._compile (node:internal/modules/cjs/loader:1155:14)
/app/node_modules/.prisma/client/index.js:3
throw new Error(
no matter what i try
this is my Dockerfile for my node application:
FROM node:16
WORKDIR /app
COPY package*.json ./
COPY prisma ./prisma/
COPY . .
RUN npm install
EXPOSE 8000
CMD [ "node", "build/server.js" ]
my .env
MYSQL_HOST="localhost"
MYSQL_USER="game"
MYSQL_NAME="mygame"
MYSQL_PASS="mypassword"
MYSQL_ROOT_PASSWORD=mynewpassword
DB_URL="mysql://game:mypassword#localhost:3307/mygame"
DB_LOCAL_PORT=3307
DB_DOCKER_PORT=3308
NODE_LOCAL_PORT=8000
NODE_DOCKER_PORT=8000
and my package.json
{
"name": "nodejsin30min",
"version": "1.0.0",
"description": "",
"main": "./src/server.ts",
"scripts": {
"generate": "npx prisma generate",
"deploy": "npx prisma migrate deploy",
"devStart": "nodemon ./src/server.ts",
"test": "jest",
"build": "tsc -p",
"postinstall": "prisma generate"
},
"prisma": {
"schema": "./prisma/schema.prisma"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"#prisma/client": "^4.6.1",
"#socket.io/admin-ui": "^0.2.0",
"#types/jest": "^28.1.7",
"#types/mocha": "^9.1.1",
"bcrypt": "^5.1.0",
"bcrypt-helper": "^0.2.1",
"body-parser": "^1.20.1",
"chroma": "^0.0.1",
"circular-json": "^0.5.9",
"cors": "^2.8.5",
"dotenv": "^16.0.3",
"express": "^4.17.1",
"express-jwt": "^7.7.7",
"express-oauth2-jwt-bearer": "^1.2.0",
"express-openid-connect": "^2.9.0",
"express-rate-limit": "^6.7.0",
"flatted": "^3.2.5",
"jwks-rsa": "^2.1.5",
"knex": "^2.3.0",
"mysql": "^2.18.1",
"mysql2": "^2.3.3",
"prisma": "^4.6.1",
"socket.io": "^4.4.0",
"socket.io-client": "^4.4.0",
"sqlite3": "^5.0.9",
"typesync": "^0.9.2",
"underscore": "^1.13.1",
"webpack": "^5.74.0"
},
"devDependencies": {
"#prisma/client": "^4.6.1",
"#types/express": "^4.17.13",
"#types/express-jwt": "^7.4.2",
"#types/jest": "^28.1.7",
"#types/mocha": "^9.1.1",
"#types/mysql": "^2.15.21",
"#types/node": "^18.7.7",
"#types/underscore": "^1.11.4",
"jest": "^27.4.3",
"nodemon": "^2.0.15",
"prisma": "^4.6.1",
"ts-node": "^10.9.1",
"typescript": "^4.4.3"
}
}
As you can see I already tried implementing a posinstall script with no luck. I have already tried shifting around multiple prisma commands (migrate dev, migrate deploy, generate) into every possible position of my Dockerfile with no luck - always the same error. On my device I NEVER had to manually generate a client and before i implemented prisma the application could be built just fine. I have no more ideas what to look for.
any help is appreciated.
Furthermore i habe already tried leaving out enironment variables and instead hardcoding the values, which did not work either
I also tried running RUN npm i -g prisma befor a prisma generate in my Dockerfile