manage latest python version more elegantly

Author: aperrin66

.github/workflows/tests_build.yml

@@ -13,14 +13,16 @@ jobs:
   tests_and_docker_build:
     name: 'Run unit tests and build docker image'
     runs-on: 'ubuntu-20.04'
+    env:
+      latest: ${{ matrix.python_version == '3.11' && 'true' || '' }}
     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
@@ -32,9 +34,9 @@ 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
@@ -55,19 +57,19 @@ jobs:
              -e "GITHUB_REPOSITORY=$GITHUB_REPOSITORY"
              -e "GITHUB_RUN_ID=$GITHUB_RUN_ID"
              -e "GITHUB_TOKEN=$GITHUB_TOKEN"
-             "${BASE_IMAGE_NAME}:${BASE_IMAGE_TAG}-python${{ matrix.version.python }}"
+             "${BASE_IMAGE_NAME}:${BASE_IMAGE_TAG}-python${{ matrix.python_version }}"
              bash -c "
              python setup.py sdist &&
              coverage run --omit=nansat/mappers/*,nansat/tests/*,nansat/nansatmap.py --source=nansat setup.py test"
 
       - name: 'Install Python 3.11'
-        if: ${{ matrix.version.latest }}
+        if: ${{ env.latest }}
         uses: actions/setup-python@v4
         with:
           python-version: '3.11'
 
       - name: 'Upload coverage to coveralls.io'
-        if: ${{ matrix.version.latest }}
+        if: ${{ env.latest }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: pip install coveralls && coveralls --service=github
@@ -77,14 +79,14 @@ jobs:
         with:
           context: .
           build-args: |
-            BASE_IMAGE=${{ env.BASE_IMAGE_NAME }}:${{ env.BASE_IMAGE_TAG }}-python${{ matrix.version.python }}
+            BASE_IMAGE=${{ env.BASE_IMAGE_NAME }}:${{ env.BASE_IMAGE_TAG }}-python${{ matrix.python_version }}
             NANSAT_RELEASE=${{ github.ref_type == 'tag' && github.ref_name || '0.0.0' }}
           push: ${{ github.ref_type == 'tag' }}
           tags: |
-            ${{ env.IMAGE_NAME }}:${{ github.ref_name }}-python${{ matrix.version.python }}
-            ${{ matrix.version.latest && format('{0}:{1}', env.IMAGE_NAME, github.ref_name) || '' }}
-            ${{ env.IMAGE_NAME }}:latest-python${{ matrix.version.python }}
-            ${{ matrix.version.latest && format('{0}:latest', env.IMAGE_NAME) || '' }}
+            ${{ env.IMAGE_NAME }}:${{ github.ref_name }}-python${{ matrix.python_version }}
+            ${{ env.latest && format('{0}:{1}', env.IMAGE_NAME, github.ref_name) || '' }}
+            ${{ env.IMAGE_NAME }}:latest-python${{ matrix.python_version }}
+            ${{ 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