Unable to access the Postgres database only from my App but can access from local machine

FROM node:lts

RUN mkdir /src
RUN mkdir -p /src/server/credentials

ARG PORT
ARG API_SERVER_PORT
ARG API_BASE_PATH
ARG DATABASE_URL
ARG FIREBASE_CREDENTIAL_BASE64
ARG GOOGLE_APPLICATION_CREDENTIALS

WORKDIR /src

COPY . .
RUN yarn install --cwd server

RUN echo $FIREBASE_CREDENTIAL_BASE64 | base64 -di > ./server/credentials/firebase-adminsdk-credentials.json
RUN yarn run build:server

EXPOSE 80
CMD yarn run start:server

FROM node:lts

RUN mkdir /src
RUN mkdir -p /src/server/credentials

ARG PORT
ARG API_SERVER_PORT
ARG API_BASE_PATH
ARG DATABASE_URL
ARG FIREBASE_CREDENTIAL_BASE64
ARG GOOGLE_APPLICATION_CREDENTIALS

WORKDIR /src

COPY . .
RUN yarn install --cwd server

RUN echo $FIREBASE_CREDENTIAL_BASE64 | base64 -di > ./server/credentials/firebase-adminsdk-credentials.json
RUN yarn run build:server

EXPOSE 80
CMD yarn run start:server

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["interactiveTransactions"]
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["interactiveTransactions"]
}