feat: add devcontainer configuration and installation script

Add a devcontainer configuration to streamline the development 
environment setup. Introduce an `install.sh` script to install 
the project in editable mode. Update the Dockerfile to use 
the `python:3.13-slim-bullseye` base image and install 
dependencies using `apt-get` for better compatibility.

.devcontainer/devcontainer.json

@@ -0,0 +1,30 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/docker-existing-dockerfile
+{
+	"name": "Existing Dockerfile",
+	"build": {
+		// Sets the run context to one level up instead of the .devcontainer folder.
+		"context": "..",
+		// Update the 'dockerFile' property if you aren't using the standard 'Dockerfile' filename.
+		"dockerfile": "../Dockerfile"
+	},
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+	"features": {
+		"ghcr.io/devcontainers-extra/features/hatch:2": {}
+	},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Uncomment the next line to run commands after the container is created.
+	// "postCreateCommand": "cat /etc/os-release",
+	"postCreateCommand": "./install.sh",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as an existing user other than the container default. More info: https://aka.ms/dev-containers-non-root.
+	"remoteUser": "root"
+}

Dockerfile

@@ -1,9 +1,11 @@
-FROM python:3.13-alpine
+FROM python:3.13-slim-bullseye
 
 USER root
 
 # Runtime dependency
-RUN apk add --no-cache ffmpeg
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+ && rm -rf /var/lib/apt/lists/*
 
 RUN pip install markitdown
 

install.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# Install the current project in editable mode
+echo "Installing the project in editable mode..."
+pip install -e .
+
+echo "Setup complete!"