Maybe fix?

Dockerfile

@@ -27,6 +27,9 @@ COPY . .
 # Uncomment the following line in case you want to disable telemetry during the build.
 ENV NEXT_TELEMETRY_DISABLED 1
 
+# Install dependencies
+RUN yarn 
+
 # Build the project
 RUN yarn build 
 
@@ -53,8 +56,6 @@ COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 COPY --from=builder --chown=nextjs:nodejs /app/public ./.next/static
 
-# Install dependencies
-RUN yarn 
 
 RUN chown -R nextjs:nodejs /app
 
@@ -64,5 +65,4 @@ EXPOSE 3000
 
 ENV PORT 3000
 
-ENTRYPOINT yarn react-env
-CMD ["node", "server.js"]
+CMD ["npm", "run", "start"]

package.json

@@ -4,7 +4,7 @@
 	"scripts": {
 		"dev": "react-env -- next",
 		"build": "next build",
-		"start": "react-env -- APP_ENV=production next start -p 3001",
+		"start": "react-env -- && APP_ENV=production node server.js",
 		"lint": "next lint"
 	},
 	"dependencies": {

yarn.lock

@@ -17,7 +17,8 @@
 
 "@beam-australia/react-env@^3.1.1":
   version "3.1.1"
-  resolved "https://registry.npmjs.org/@beam-australia/react-env/-/react-env-3.1.1.tgz"
+  resolved "https://registry.yarnpkg.com/@beam-australia/react-env/-/react-env-3.1.1.tgz#63cb8316861b8fbdb4b9c550a62139cd90675e40"
+  integrity sha512-LdWzgqmu116t9+sOvONyB21bBmI8dm8g8s3KhnJVzCcK93GrdSisuIOtOkQPMYgenmVGTWQwWnbLAgoka/jAFw==
   dependencies:
     cross-spawn "^6.0.5"
     dotenv "^8.0.0"