feat: use a unique Dockerfile for all Odoo versions

Author: florentx

.github/workflows/build.yaml

@@ -30,12 +30,16 @@ jobs:
     strategy:
       matrix:
         odoo_serie:
-          - "14.0"
           - "15.0"
           - "16.0"
           - "17.0"
           - "18.0"
           - "19.0"
+        python_from:
+          - "python:3.12-slim-trixie"
+        include:
+          - odoo_serie: "14.0"
+            python_from: "python:3.9-slim-trixie"
 
     steps:
       - uses: actions/checkout@v4
@@ -69,6 +73,10 @@ jobs:
         uses: docker/build-push-action@v3
         with:
           context: ./build
+          build-args: |
+              VERSION={{ matrix.odoo_serie }}
+          build-contexts: |
+              python=docker-image://{{ matrix.python_from }}
           push: false
           load: true
           tags: ci-5xx-latest:${{ matrix.odoo_serie }}