fix image ref and add groups

.woodpecker/sanity-test.yml

@@ -8,6 +8,7 @@ when:
 variables:
   - &ansible_base
     image: docker.io/library/python:3.10
+    group: ansible
     commands:
       - pip install poetry -qq
       - poetry install --all-extras --no-root

.woodpecker/unit-test.yml

@@ -7,6 +7,7 @@ when:
 
 variables:
   - &pytest_base
+    group: pytest
     commands:
       - git fetch --depth=2147483647
       - pip install poetry -qq
@@ -17,19 +18,19 @@ variables:
 
 steps:
   pyton-312:
-    image: docker.io/library/python:python:3.12
+    image: docker.io/library/python:3.12
     <<: *pytest_base
 
   pyton-311:
-    image: docker.io/library/python:python:3.11
+    image: docker.io/library/python:3.11
     <<: *pytest_base
 
   pyton-310:
-    image: docker.io/library/python:python:3.10
+    image: docker.io/library/python:3.10
     <<: *pytest_base
 
   pyton-39:
-    image: docker.io/library/python:python:3.9
+    image: docker.io/library/python:3.9
     <<: *pytest_base
 
 depends_on: