Fix environment variable syntax in drone file

Reviewed-on: #15

.drone.yml

@@ -5,13 +5,15 @@ steps:
   - name: docker
     image: plugins/docker
     settings:
+      registry: git.clortox.com
+      repo: git.clortox.com/infrastructure/memerr
       username:
-        from_secret: dockerhub_username
+        from_secret: gitea_docker_username
       password:
-        from_secret: dockerhub_password
-      repo:
-        from_secret: dockerhub_repo
-      tags: latest
+        from_secret: gitea_docker_password
+      tags:
+        - latest
+        - "1.0.${DRONE_BUILD_NUMBER}"
     when:
       branch:
         - main

Dockerfile

@@ -1,4 +1,4 @@
-FROM python
+FROM python:3.10
 
 WORKDIR /usr/src/app