feat: add Prisma configuration file and update Dockerfile to include it

backend/Dockerfile

@@ -7,6 +7,7 @@ WORKDIR /app
 # Kopiera backend-filer
 COPY package.json ./
 COPY prisma ./prisma
+COPY prisma.config.ts ./
 COPY src ./src
 COPY tsconfig.json ./
 COPY nest-cli.json ./