Docker angular container fails due to angular-devkit

I am having issues with running an angular 19 inside docker container. I get the error: Node packages may not be installed. Try installing with 'npm install'. Error: Could not find the '@angular-devkit/build-angular:dev-server' builder's node package. This is my Dockerfile:

FROM node:20

# Set working dir
WORKDIR /app

# Install Angular CLI
RUN npm install -g @angular/cli@19

# Generate self-signed SSL certificates for Angular
RUN mkdir -p /etc/ssl/certs && \
openssl req -x509 -newkey rsa:4096 -nodes \
-keyout /etc/ssl/certs/angular.key \
-out /etc/ssl/certs/angular.crt \
-days 365 \
-subj "/CN=angular.local"

# Set secure permissions after cert generation
RUN chmod 600 /etc/ssl/certs/angular.key && \
chmod 644 /etc/ssl/certs/angular.crt


# If package.json exists, install deps
COPY frontend/package*.json ./

RUN [ -f package.json ] && npm install || echo "Skipping npm install (no package.json yet)"


# Copy remaining files
COPY frontend/ .

# Generate certs and run HTTPS server
CMD ["ng", "serve", "--host", "0.0.0.0", "--ssl", "true", "--ssl-key", "/etc/ssl/certs/angular.key", "--ssl-cert", "/etc/ssl/certs/angular.crt"]


And this is my package.json:

{
"name": "frontend",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"watch": "ng build --watch --configuration development",
"test": "ng test"
},
"private": true,
"dependencies": {
"@angular/cdk": "^19.2.18",
"@angular/common": "^19.2.0",
"@angular/compiler": "^19.2.0",
"@angular/core": "^19.2.0",
"@angular/forms": "^19.2.0",
"@angular/material": "^19.2.18",
"@angular/platform-browser": "^19.2.0",
"@angular/platform-browser-dynamic": "^19.2.0",
"@angular/router": "^19.2.0",
"chart.js": "^4.5.0",
"ng2-charts": "^8.0.0",
"rxjs": "~7.8.0",
"tslib": "^2.3.0",
"zone.js": "~0.15.0"

},
"devDependencies": {
"@angular-devkit/build-angular": "^19.2.15",
"@angular/cli": "^19.2.15",
"@angular/compiler-cli": "^19.2.0",
"@types/jasmine": "~5.1.0",
"jasmine-core": "~5.6.0",
"karma": "~6.4.0",
"karma-chrome-launcher": "~3.2.0",
"karma-coverage": "~2.2.0",
"karma-jasmine": "~5.1.0",
"karma-jasmine-html-reporter": "~2.1.0",
"typescript": "~5.7.2"
}
}


Any help is appreciated,thanks!

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