fix: be specific about docker img tags

.woodpecker.yml

@@ -1,6 +1,6 @@
 pipeline:
   build:
-    image: python
+    image: python:3.11.0-bullseye
     when:
       event: [push, pull_request, tag, deployment]
     commands:
@@ -9,7 +9,7 @@ pipeline:
       - make
 
   publish:
-    image: python
+    image: python:3.11.0-bullseye
     when:
       event: push
       branch: main