build: test for latest only once

Author: aperrin66

.github/workflows/build_images.yml

@@ -12,7 +12,7 @@ jobs:
   build_docker_images:
     runs-on: 'ubuntu-20.04'
     env:
-      latest_python: '3.11'
+      latest: ${{ matrix.python_version == '3.11' && 'true' || '' }}
     strategy:
       matrix:
         python_version:
@@ -52,8 +52,8 @@ jobs:
           tags: |
             ${{ env.IMAGE_NAME }}:latest-python${{ matrix.python_version }}
             ${{ env.IMAGE_NAME }}:${{ github.ref_name }}-python${{ matrix.python_version }}
-            ${{ (matrix.python_version == env.latest_python) && format('{0}:{1}', env.IMAGE_NAME, github.ref_name) || '' }}
-            ${{ (matrix.python_version == env.latest_python) && format('{0}:latest', env.IMAGE_NAME) || '' }}
+            ${{ env.latest && format('{0}:{1}', env.IMAGE_NAME, github.ref_name) || '' }}
+            ${{ env.latest && format('{0}:latest', env.IMAGE_NAME) || '' }}
           cache-from: |
             type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache-new