add black formatting on-save, to edited file only, to devcontainer

.devcontainer/devcontainer.json

@@ -11,9 +11,6 @@
   ],
   "customizations": {
     "vscode": {
-      "settings": {
-        "files.defaultWorkspace": "/workspaces/model"
-      },
       "extensions": [
         "ms-python.python",
         "ms-toolsai.jupyter",
@@ -24,8 +21,17 @@
         "fabiospampinato.vscode-todo-plus",
         "jgclark.vscode-todo-highlight",
         "corentinartaud.pdfpreview",
-        "ms-python.vscode-python-envs"
-      ]
+        "ms-python.vscode-python-envs",
+        "ms-python.black-formatter"
+      ],
+      "settings": {
+        "files.defaultWorkspace": "/workspaces/model",
+        "[python]": {
+          "editor.defaultFormatter": "ms-python.black-formatter",
+          "editor.formatOnSave": true
+        },
+        "python.formatting.provider": "none"
+      }
     }
   },
   "containerEnv": {

.devcontainer/requirements.txt

@@ -17,4 +17,6 @@ sqlmodel
 # Testing
 pytest==9.0.2
 pytest-cov==7.0.0
-ipykernel>=6.25,<7
+ipykernel>=6.25,<7
+# Formatting
+black==26.1.0