use docker-compose.dev.yml in devcontainer.json

.devcontainer/devcontainer.json

@@ -1,30 +1,44 @@
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the
-// README at: https://github.com/devcontainers/templates/tree/main/src/ubuntu
+// README at: https://github.com/devcontainers/templates/tree/main/src/docker-existing-docker-compose
 {
-	"name": "Ubuntu",
-	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/base:jammy",
+	"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.dev.yml",
+		"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": "app",
+
+	// 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": "/workspaces/${localWorkspaceFolderBasename}",
 	"features": {
-		"ghcr.io/devcontainers/features/python:1": {
-			"installTools": true,
-			"version": "3.10"
-		}
+		"ghcr.io/devcontainers/features/docker-outside-of-docker:1": {}
 	},
 
 	// 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.
-	"forwardPorts": [
-		8000,9080
-	],
+	"forwardPorts": [9080]
 
-	// Use 'postCreateCommand' to run commands after the container is created.
-	"postCreateCommand": "pip3 install --user -r requirements.txt"
+	// 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.
+	// "postCreateCommand": "cat /etc/os-release",
 
 	// Configure tool-specific properties.
 	// "customizations": {},
 
-	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
-	// "remoteUser": "root"
+	// Uncomment to connect as an existing user other than the container default. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "devcontainer"
 }

.devcontainer/docker-compose.yml

@@ -0,0 +1,26 @@
+version: '3.8'
+services:
+  # Update this to the name of the service you want to work with in your docker-compose.yml file
+  app:
+    # Uncomment if you want to override the service's Dockerfile to one in the .devcontainer 
+    # folder. Note that the path of the Dockerfile and context is relative to the *primary* 
+    # docker-compose.yml file (the first in the devcontainer.json "dockerComposeFile"
+    # array). The sample below assumes your primary file is in the root of your project.
+    #
+    # build:
+    #   context: .
+    #   dockerfile: .devcontainer/Dockerfile
+
+    volumes:
+      # Update this to wherever you want VS Code to mount the folder of your project
+      - ..:/workspaces:cached
+
+    # Uncomment the next four lines if you will use a ptrace-based debugger like C++, Go, and Rust.
+    # cap_add:
+    #   - SYS_PTRACE
+    # security_opt:
+    #   - seccomp:unconfined
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+ 

Dockerfile

@@ -0,0 +1,14 @@
+FROM mcr.microsoft.com/devcontainers/base:jammy
+
+RUN apt-get update && apt-get install -y \
+    python3-pip \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt ./
+RUN pip3 install --no-cache-dir -r requirements.txt
+
+WORKDIR /app
+
+COPY ./app /app
+
+EXPOSE 9080

docker-compose.dev.yml

@@ -0,0 +1,8 @@
+version: '3.8'
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    ports:
+      - "9080:8000"