add devcontainer config

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/vscode/devcontainers/base:debian

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/java-postgres
+{
+	"name": "Java & PostgreSQL",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "app",
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+	"features": {
+		"ghcr.io/devcontainers-contrib/features/sbt-sdkman:2": {
+			"jdkVersion": "11"
+		},
+		"ghcr.io/devcontainers-contrib/features/scala-sdkman:2": {
+			"jdkVersion": "11"
+		},
+		"ghcr.io/devcontainers-contrib/features/scalacli-sdkman:2": {
+			"jdkVersion": "11"
+		},
+	},
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {}
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// This can be used to network with other containers or with the host.
+	// "forwardPorts": [
+	// 	51000,
+	// 	51001,
+	// 	51002
+	// ],
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"scalameta.metals",
+				"scala-lang.scala"
+			]
+		}
+	}
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "java -version",
+	// Configure tool-specific properties.
+	// "customizations": {},
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.devcontainer/docker-compose.yml

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+version: "3.8"
+
+volumes:
+  postgres-data:
+
+services:
+  app:
+    container_name: javadev
+    build:
+      context: .
+      dockerfile: Dockerfile
+    environment:
+      CONFIG_FORCE_database_host: postgres
+      CONFIG_FORCE_bind: 0.0.0.0
+    volumes:
+      - ../..:/workspaces:cached
+    command: sleep infinity
+    # network_mode: service:postgres
+    ports:
+      - "51000:51000/udp"
+      - "51001:51001/udp"
+      # - "51000:51002"
+  postgres:
+    image: postgres:latest
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: psforever
+      POSTGRES_USER: psforever
+      POSTGRES_DB: psforever