Fix Dockerfile and production start script

[fityannugroho]

PR Checklist

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• The commit message follows our Contributing Guidelines
• Tests for the changes have been added (optional, for bug fixes or features)
• Docs have been added / updated (optional, for bug fixes or features)

PR Type

What kind of change does this PR introduce?

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• Bug fix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes

What is the current behavior?

Please describe the current behavior that you are modifying, or link to a relevant issue.

Issue Number: N/A

• Can't run pnpm run start:prod
• Can't build the docker image

What is the new behavior?

This pull request includes changes to the Dockerfile and package.json to improve the build process and correct the production start script. The most important changes include consolidating commands in the Dockerfile and fixing the path for the production start script in package.json.

Improvements to Dockerfile:

• Consolidated the installation of pnpm and creation of the working directory into a single command in both stages of the Dockerfile.
• Combined multiple COPY commands into fewer commands to streamline the Dockerfile.
• Combined the commands to run the Prisma generator and build the application into a single command.

Fixes in package.json:

• Corrected the path for the production start script from dist/src/main to dist/main.

Other information

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