manage latest python version more elegantly

Author: aperrin66

.github/workflows/build_images.yml

@@ -11,14 +11,16 @@ env:
 jobs:
   build_docker_images:
     runs-on: 'ubuntu-20.04'
+    env:
+      latest_python: '3.11'
     strategy:
       matrix:
-        version:
-          - {'python': '3.7', 'latest': false}
-          - {'python': '3.8', 'latest': false}
-          - {'python': '3.9', 'latest': false}
-          - {'python': '3.10', 'latest': false}
-          - {'python': '3.11', 'latest': true}
+        python_version:
+          - '3.7'
+          - '3.8'
+          - '3.9'
+          - '3.10'
+          - '3.11'
     steps:
       - name: 'Checkout repository'
         uses: actions/checkout@v4
@@ -30,9 +32,9 @@ jobs:
         uses: actions/cache@v3
         with:
           path: /tmp/.buildx-cache
-          key: ${{ runner.os }}-buildx-python${{ matrix.version.python }}-${{ github.sha }}
+          key: ${{ runner.os }}-buildx-python${{ matrix.python_version }}-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-buildx-python${{ matrix.version.python }}-
+            ${{ runner.os }}-buildx-python${{ matrix.python_version }}-
 
       - name: Login to DockerHub
         uses: docker/login-action@v3
@@ -45,13 +47,13 @@ jobs:
         with:
           context: .
           file: Dockerfile
-          build-args: 'PYTHON_VERSION=${{ matrix.version.python }}'
+          build-args: 'PYTHON_VERSION=${{ matrix.python_version }}'
           push: ${{ github.ref_type == 'tag' }}
           tags: |
-            ${{ env.IMAGE_NAME }}:latest-python${{ matrix.version.python }}
-            ${{ env.IMAGE_NAME }}:${{ github.ref_name }}-python${{ matrix.version.python }}
-            ${{ matrix.version.latest && format('{0}:{1}', env.IMAGE_NAME, github.ref_name) || '' }}
-            ${{ matrix.version.latest && format('{0}:latest', env.IMAGE_NAME) || '' }}
+            ${{ env.IMAGE_NAME }}:latest-python${{ 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) || '' }}
           cache-from: |
             type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache-new