Add specific versions for docker images

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.8-alpine
+FROM python:3.8.5-alpine3.12
 
 RUN mkdir code
 WORKDIR code

docker-compose.yml

@@ -40,7 +40,7 @@ services:
     image: redis
   # Db stuff
   db:
-    image: mysql
+    image: mysql:8.0.21
     command: --default-authentication-plugin=mysql_native_password
     environment:
       MYSQL_ROOT_PASSWORD: example
@@ -49,7 +49,7 @@ services:
       MYSQL_PASSWORD: kers
   # DB visual panel
   adminer:
-    image: adminer
+    image: adminer:latest
     depends_on:
       - db
     ports: