heroku PORT

docker-compose.yml

@@ -4,4 +4,4 @@ services:
     build: .
     image: tex2html
     ports:
-      - "5000:5000"
+      - "3000:3000"

wsgi.py

 from main import app
+import os
 
 if __name__=="__main__":
-    app.run(host='0.0.0.0')
\ No newline at end of file
+    port = int(os.environ.get('PORT', 5000))
+    app.run(host='0.0.0.0',port=port)
\ No newline at end of file