Setup GitHub Codespaces

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/vscode/devcontainers/rust:0-1
+
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+     && apt-get -y install --no-install-recommends postgresql-client
+
+# TODO: pre-build custom images, those take too much time
+#RUN cargo install sqlx-cli --no-default-features --features postgres
+#RUN cargo install cargo-edit

.devcontainer/devcontainer.json

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+{
+	"name": "Rust",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "app",
+	"workspaceFolder": "/workspace",
+
+	"postCreateCommand": "SQLX_OFFLINE=1 cargo run -- database migrate",
+	"settings": { 
+		"lldb.executable": "/usr/bin/lldb",
+		"sqltools.connections": [{
+			"name": "Container database",
+			"driver": "PostgreSQL",
+			"previewLimit": 50,
+			"server": "localhost",
+			"port": 5432,
+			"database": "postgres",
+			"username": "postgres",
+			"password": "postgres"
+		}],
+		"files.watcherExclude": {
+			"**/target/**": true
+		}
+	},
+
+	"forwardPorts": [8080],
+	"portsAttributes": {
+		"8080": {
+			"label": "Application"
+		}
+	},
+
+	"extensions": [
+		"bungcip.better-toml",
+		"vadimcn.vscode-lldb",
+		"mutantdino.resourcemonitor",
+		"matklad.rust-analyzer",
+		"mtxr.sqltools",
+		"mtxr.sqltools-driver-pg"
+	]
+}

.devcontainer/docker-compose.yml

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+version: '3'
+
+services:
+  app:
+    build: 
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      - ..:/workspace:cached
+
+    environment: 
+      # FIXME: sqlx-cli and the app use different URIs
+      DATABASE_URL: postgresql://postgres:postgres@localhost/postgres
+      MAS_DATABASE_URI: postgresql://postgres:postgres@localhost/postgres
+      MAS_COOKIES_SECRET: a093e76c2ddc87d9de7afc1f9059d60a12176b2cdf8966029c00bc2146518a61
+      
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+
+    # Runs app on the same network as the database container, allows "forwardPorts" in devcontainer.json function.
+    network_mode: service:db
+
+  db:
+    image: postgres:latest
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_USER: postgres
+      POSTGRES_DB: postgres
+
+volumes:
+  postgres-data: