Add a dev container definition

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/vscode-remote/devcontainer.json or this file's README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.117.1/containers/docker-existing-docker-compose
+// If you want to run as a non-root user in the container, see .devcontainer/docker-compose.yml.
+{
+	"name": "Existing Docker Compose (Extend)",
+	// Update the 'dockerComposeFile' list if you have more compose files or use different names.
+	// The .devcontainer/docker-compose.yml file contains any overrides you need/want to make.
+	"dockerComposeFile": [
+		"..\\docker-compose.yml",
+	],
+	// The 'service' property is the name of the service for the container that VS Code should
+	// use. Update this value and .devcontainer/docker-compose.yml to the real service name.
+	"service": "loggex",
+	// The optional 'workspaceFolder' property is the path VS Code should open by default when
+	// connected. This is typically a file mount in .devcontainer/docker-compose.yml
+	"workspaceFolder": "/loggex",
+	// Set *default* container specific settings.json values on container create.
+	"settings": {
+		"terminal.integrated.shell.linux": null
+	},
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"mjmcloug.vscode-elixir"
+	]
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+	// Uncomment the next line if you want start specific services in your Docker Compose config.
+	// "runServices": [],
+	// Uncomment the next line if you want to keep your containers running after VS Code shuts down.
+	// "shutdownAction": "none",
+	// Uncomment the next line to run commands after the container is created - for example installing git.
+	// "postCreateCommand": "apt-get update && apt-get install -y git",
+	// Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
+	// "remoteUser": "vscode"
+}

Dockerfile

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+FROM elixir:1.2.5

docker-compose.yml

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+version: "3.4"
+services:
+  loggex:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    ports:
+      - 6438:6438
+
+    volumes:
+      - .:/loggex:cached
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+
+    links:
+      - db
+
+  db:
+    image: postgres
+    restart: unless-stopped
+    ports: 
+      - 5432:5432
+    environment:
+      POSTGRES_PASSWORD: pass
+      POSTGRES_USER: user
+      POSTGRES_DB: data