Fix Docker files for correct start

Dockerfile

@@ -3,9 +3,6 @@ FROM python:3.8-slim-buster
 WORKDIR /usr/src/app
 
 COPY requirements.txt ./
-RUN pip install --no-cache-dir -r requirements.txt
+RUN pip3 install --no-cache-dir -r requirements.txt
 
 COPY . .
-
-ARG script=scalesrv.py
-CMD [ "python", $script ]

docker-compose.yml

@@ -1,14 +1,10 @@
 version: '3'
 services:
   server:
-    build:
-      context: .
-      args:
-        script: scalesrv.py
+    build: .
+    command: python3 scalesrv.py
     ports:
       - "18001:18001"
   clustering:
-    build:
-      context: .
-      args:
-        script: cluster.py
+    build: .
+    command: python3 cluster.py