Add database to devcontainer

.devcontainer/.env.example

@@ -0,0 +1,4 @@
+POSTGRES_DB="database"
+POSTGRES_HOST="database"
+POSTGRES_PASSWORD="password"
+POSTGRES_USER="user"

.devcontainer/devcontainer.json

@@ -1,6 +1,8 @@
 {
     "name": "Mortein Backend Application",
-    "image": "mcr.microsoft.com/devcontainers/dotnet:8.0",
+    "dockerComposeFile": "docker-compose.yaml",
+    "service": "devcontainer",
+    "workspaceFolder": "/workspaces/backend",
 
     "features": {
         "ghcr.io/devcontainers/features/dotnet:2": {},
@@ -15,6 +17,7 @@
             "extensions": [
                 "esbenp.prettier-vscode",
                 "github.vscode-github-actions",
+                "ms-azuretools.vscode-docker",
                 "ms-dotnettools.csdevkit",
                 "redhat.vscode-yaml"
             ]

.devcontainer/docker-compose.yaml

@@ -0,0 +1,23 @@
+version: "3.8"
+
+services:
+  devcontainer:
+    command: sleep infinity
+    env_file: .env
+    image: mcr.microsoft.com/devcontainers/dotnet:8.0
+    networks:
+      - network
+    volumes:
+      - ..:/workspaces/backend:cached
+
+  database:
+    env_file: .env
+    image: postgres:latest
+    networks:
+      - network
+    ports:
+      - 5432:5432
+
+networks:
+  network:
+    driver: bridge