Basic setup of dev container. (#35351)

Author: cincuranet

Diff for: .devcontainer/devcontainer.json

@@ -0,0 +1,21 @@
+{
+    "name": "EF Core dev environment",
+    "dockerComposeFile": "docker-compose.yml",
+    "service": "devcontainer",
+    "workspaceFolder": "/workspace",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-dotnettools.csdevkit",
+                "EditorConfig.EditorConfig"
+            ],
+            "settings": {
+                "dotnet.dotnetPath": "${containerWorkspaceFolder}/efcore/.dotnet"
+            }
+        }
+    },
+    "remoteEnv": {
+        "PATH": "${containerWorkspaceFolder}/efcore/.dotnet:${containerEnv:PATH}"
+    },
+    "onCreateCommand": "${containerWorkspaceFolder}/efcore/restore.sh"
+}

Diff for: .devcontainer/docker-compose.yml

@@ -0,0 +1,7 @@
+version: '3.8'
+services:
+  devcontainer:
+    image: mcr.microsoft.com/dotnet/sdk:9.0
+    volumes:
+      - ..:/workspace/efcore:cached
+    tty: true