feat(devcontainers): add initial dev containers configs

{{cookiecutter.project_name|replace(" ", "")}}/.devcontainer/README.md

@@ -0,0 +1,53 @@
+# Development Container Setup
+
+This project includes Dev Container support for VS Code and other compatible editors.
+
+## Quick Start
+
+### Option 1: Using VS Code Dev Containers Extension (Recommended)
+1. Install the [Dev Containers extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers)
+2. Open this project in VS Code
+3. Click "Reopen in Container" when prompted, or use Command Palette: `Dev Containers: Reopen in Container`
+
+### Option 2: Attach to Running Container
+1. Start the dev container:
+   ```bash
+   task dev-container
+   ```
+2. In VS Code, use Command Palette: `Dev Containers: Attach to Running Container`
+3. Select the `{{ cookiecutter.project_slug }}-dev` container
+
+### Option 3: Manual Docker Commands
+```bash
+# Build and start the dev container
+task dev-container
+
+# Access the container shell
+docker exec -it {{ cookiecutter.project_slug }}-dev bash
+
+# Stop the container when done
+task dev-container-stop
+```
+
+## Features
+
+The dev container includes:
+- Python {{ cookiecutter.python_version }}+ with uv package manager
+- All project dependencies (including dev dependencies)
+- Git, GitHub CLI, Task, and pre-commit tools
+- VS Code extensions for Python development
+- Proper volume mounts for live code editing
+
+## Environment
+
+- `DEV_MODE=true` - Installs all development dependencies
+- `PYTHONPATH=/workspace/src` - Ensures proper module imports
+- Working directory: `/workspace`
+
+## Troubleshooting
+
+If you encounter issues:
+1. Ensure Docker is running
+2. Check that you have the latest Dev Containers extension
+3. Try rebuilding the container: `Dev Containers: Rebuild Container`
+4. For manual setup, ensure you run `task init` after container starts

{{cookiecutter.project_name|replace(" ", "")}}/.devcontainer/devcontainer.json

@@ -0,0 +1,53 @@
+{
+  "name": "{{ cookiecutter.project_name }}",
+  "dockerComposeFile": "docker-compose.yml",
+  "service": "dev",
+  "workspaceFolder": "/workspace",
+  "features": {
+    "ghcr.io/devcontainers/features/git:1": {},
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers-contrib/features/task:1": {},
+    "ghcr.io/devcontainers-contrib/features/pre-commit:2": {}
+  },
+  "customizations": {
+    "vscode": {
+      "settings": {
+        "python.defaultInterpreterPath": "/app/.venv/bin/python",
+        "python.formatting.provider": "none",
+        "[python]": {
+          "editor.defaultFormatter": "charliermarsh.ruff",
+          "editor.formatOnSave": true,
+          "editor.codeActionsOnSave": {
+            "source.fixAll.ruff": "explicit",
+            "source.organizeImports.ruff": "explicit"
+          }
+        },
+        "python.testing.pytestArgs": [
+          "tests"
+        ],
+        "python.testing.unittestEnabled": false,
+        "python.testing.pytestEnabled": true,
+        "python.linting.enabled": false,
+        "python.analysis.typeCheckingMode": "basic",
+        "editor.rulers": [120]
+      },
+      "extensions": [
+        "ms-python.python",
+        "ms-python.vscode-pylance",
+        "charliermarsh.ruff",
+        "tamasfe.even-better-toml",
+        "redhat.vscode-yaml",
+        "ms-azuretools.vscode-docker",
+        "GitHub.vscode-pull-request-github",
+        "GitHub.copilot"
+      ]
+    }
+  },
+  "postCreateCommand": "cd /workspace && task init",
+  "postStartCommand": "git config --global --add safe.directory /workspace",
+  "containerEnv": {
+    "DEV_MODE": "true",
+    "PYTHONPATH": "/workspace/src"
+  },
+  "remoteUser": "root"
+}

{{cookiecutter.project_name|replace(" ", "")}}/.devcontainer/docker-compose.yml

@@ -0,0 +1,34 @@
+version: '3.8'
+
+services:
+  dev:
+    build:
+      context: ..
+      dockerfile: Dockerfile
+      target: builder
+      args:
+        PYTHON_VERSION: {{ cookiecutter.python_version }}
+        DEV_MODE: "true"
+    volumes:
+      # Mount the entire project directory
+      - ..:/workspace:cached
+      # Cache directories for faster rebuilds
+      - uv-cache:/root/.cache/uv
+    environment:
+      - DEV_MODE=true
+      - PYTHONPATH=/workspace/src
+      - UV_COMPILE_BYTECODE=1
+      - UV_LINK_MODE=copy
+    working_dir: /workspace
+    # Overwrite the default command to keep container running
+    command: sleep infinity
+    # Network mode for easier debugging and service access
+    network_mode: host
+    # Add capabilities needed for debugging
+    cap_add:
+      - SYS_PTRACE
+    security_opt:
+      - seccomp:unconfined
+
+volumes:
+  uv-cache:

{{cookiecutter.project_name|replace(" ", "")}}/Taskfile.yml

@@ -184,6 +184,61 @@ tasks:
       # rebuild the builder instance, updating its BuildKit. There's no harm in running this even if we didn't do the `docker buildx rm` previously
       - task: init-docker-multiplatform
 
+  dev-container:
+    desc: Build and start development container
+    vars:
+      TIMESTAMP:
+        sh: '{{ '{{.RUN_SCRIPT}}' }} {{ '{{.SCRIPTS_DIR}}' }}/get_rfc3339_timestamp.py'
+      COMMIT_HASH:
+        sh: git rev-parse HEAD
+      DESCRIPTION: "{{ cookiecutter.project_short_description | replace('"', '\\"') | replace("'", "\\\\'") }}"
+    cmds:
+      # Stop any existing container
+      - docker stop {{ '{{.PROJECT_SLUG}}' }}-dev 2>/dev/null || true
+      - docker rm {{ '{{.PROJECT_SLUG}}' }}-dev 2>/dev/null || true
+      # Build the dev image
+      - |
+        docker buildx build \
+          --platform {{ '{{.LOCAL_PLATFORM}}' }} \
+          --load \
+          --target builder \
+          --build-arg PYTHON_VERSION="{{ '{{.PYTHON_VERSION}}' }}" \
+          --build-arg DEV_MODE="true" \
+          --build-arg NAME="{{ '{{.PROJECT_SLUG}}' }}" \
+          --build-arg DESCRIPTION="{{ '{{.DESCRIPTION}}' }}" \
+          --build-arg TIMESTAMP="{{ '{{.TIMESTAMP}}' }}" \
+          --build-arg COMMIT_HASH="{{ '{{.COMMIT_HASH}}' }}" \
+          -t {{ '{{.IMAGE_NAME}}' }}-dev:latest \
+          .
+      # Start the container in detached mode
+      - |
+        docker run -d \
+          --name {{ '{{.PROJECT_SLUG}}' }}-dev \
+          -v "$(pwd):/workspace:cached" \
+          -v "{{ '{{.PROJECT_SLUG}}' }}-uv-cache:/root/.cache/uv" \
+          -e DEV_MODE=true \
+          -e PYTHONPATH=/workspace/src \
+          --network host \
+          --cap-add SYS_PTRACE \
+          --security-opt seccomp=unconfined \
+          {{ '{{.IMAGE_NAME}}' }}-dev:latest \
+          sleep infinity
+      - |
+        echo "✅ Development container '{{ '{{.PROJECT_SLUG}}' }}-dev' is running!"
+        echo ""
+        echo "To attach to it:"
+        echo "  • VS Code: Use 'Dev Containers: Attach to Running Container' command"
+        echo "  • Terminal: docker exec -it {{ '{{.PROJECT_SLUG}}' }}-dev bash"
+        echo ""
+        echo "To stop it: task dev-container-stop"
+
+  dev-container-stop:
+    desc: Stop and remove development container
+    cmds:
+      - docker stop {{ '{{.PROJECT_SLUG}}' }}-dev 2>/dev/null || true
+      - docker rm {{ '{{.PROJECT_SLUG}}' }}-dev 2>/dev/null || true
+      - echo "Development container stopped and removed."
+
   clean:
     desc: Clean up build artifacts, cache files/directories, temp files, etc.
     cmds: