Dockerfile from template broken

Describe the Bug

The dockerfile from the template has a lot of issues. Having fixed one by one, this last one makes no sense. Why would the docker build require access to the DB. Clearly completely misunderstood what containers are about.

13 27.64 [23:35:20] ERROR: Error: cannot connect to Postgres. Details: getaddrinfo ENOTFOUND pg
#13 27.64     err: {
#13 27.64       "type": "Error",
#13 27.64       "message": "getaddrinfo ENOTFOUND pg",
#13 27.64       "stack":
#13 27.64           Error: getaddrinfo ENOTFOUND pg
#13 27.64               at /app/node_modules/pg-pool/index.js:45:11
#13 27.64               at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
#13 27.64               at async h (/app/.next/server/chunks/9083.js:151:9649)
#13 27.64               at async Object.i [as connect] (/app/.next/server/chunks/9083.js:151:9891)
#13 27.64               at async bD.init (/app/.next/server/chunks/9083.js:277:7886)
#13 27.64               at async bG (/app/.next/server/chunks/9083.js:277:11051)
#13 27.64               at async Object.p [as generateStaticParams] (/app/.next/server/app/(frontend)/posts/page/[pageNumber]/page.js:2:8710)
#13 27.64               at async builtRouteParams (/app/node_modules/next/dist/build/static-paths/app.js:396:36)
#13 27.64               at async buildAppStaticPaths (/app/node_modules/next/dist/build/static-paths/app.js:366:25)
#13 27.64               at async /app/node_modules/next/dist/build/utils.js:925:79
#13 27.64       "errno": -3008,
#13 27.64       "code": "ENOTFOUND",
#13 27.64       "syscall": "getaddrinfo",
#13 27.64       "hostname": "pg"
#13 27.64     }

How is the docker container supposed to work?

Link to the code that reproduces this issue

123123

Reproduction Steps

123123

Which area(s) are affected? (Select all that apply)

db: postgres

Environment Info

123123