Add devcontainer config

.devcontainer/Dockerfile

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+# Use Ubuntu 24.04 as base image to match the current environment
+FROM mcr.microsoft.com/devcontainers/base:ubuntu-24.04
+
+# Install system dependencies
+# Note: Python and Git are installed via devcontainer features
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends \
+    build-essential \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install CodeQL CLI
+RUN curl -Ls -o /tmp/codeql.zip https://github.com/github/codeql-cli-binaries/releases/latest/download/codeql-linux64.zip \
+    && unzip /tmp/codeql.zip -d /opt \
+    && mv /opt/codeql /opt/codeql-cli \
+    && ln -s /opt/codeql-cli/codeql /usr/local/bin/codeql \
+    && rm /tmp/codeql.zip
+
+# Set working directory
+WORKDIR /workspaces/seclab-taskflows
+
+# The rest of the setup will be done in post-create script

.devcontainer/devcontainer.json

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+{
+  "name": "Seclab Taskflows",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": ".."
+  },
+  // Features to add to the dev container
+  "features": {
+    "ghcr.io/devcontainers/features/python:1": {
+      "version": "3.11",
+      "installTools": true
+    },
+    "ghcr.io/devcontainers/features/git:1": {
+      "version": "latest"
+    },
+    "ghcr.io/devcontainers/features/github-cli:1": {
+      "version": "latest"
+    },
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {
+      "version": "latest"
+    }
+  },
+  // Configure tool-specific properties
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-python.python",
+        "ms-python.vscode-pylance",
+        "ms-python.vscode-python-envs",
+        "redhat.vscode-yaml",
+        "GitHub.copilot",
+        "GitHub.copilot-chat",
+        "ms-azuretools.vscode-docker"
+      ],
+      "settings": {
+        "python.useEnvironmentsExtension": true
+      }
+    }
+  },
+  // Use 'forwardPorts' to make a list of ports inside the container available locally
+  "forwardPorts": [],
+  // Use 'postCreateCommand' to run commands after the container is created
+  "postCreateCommand": "bash .devcontainer/post-create.sh",
+  // Use 'postStartCommand' to run commands when the container starts
+  "postAttachCommand": "bash .devcontainer/post-attach.sh",
+  // Environment variables
+  "containerEnv": {
+    "PYTHONUNBUFFERED": "1"
+  },
+  // Set the user to use in the container (non-root)
+  "remoteUser": "vscode",
+  // Grant the container access to the host's Docker daemon
+  "runArgs": [
+    "--init"
+  ]
+}

.devcontainer/post-attach.sh

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+#!/bin/bash
+set -e
+
+# If running in Codespaces, check for necessary secrets and print error if missing
+if [ -v CODESPACES ]; then
+    echo "🔐 Running in Codespaces - injecting secrets from Codespaces settings..."
+    if [ ! -v COPILOT_TOKEN ]; then
+        echo "⚠️ Running in Codespaces - please add COPILOT_TOKEN to your Codespaces secrets"
+    fi
+    if [ ! -v GITHUB_PERSONAL_ACCESS_TOKEN ]; then
+        echo "⚠️ Running in Codespaces - please add GITHUB_PERSONAL_ACCESS_TOKEN to your Codespaces secrets"
+    fi
+fi
+
+echo "💡 Remember to activate the virtual environment: source .venv/bin/activate"

.devcontainer/post-create.sh

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+#!/bin/bash
+set -e
+
+echo "🚀 Setting up Seclab Taskflows development environment..."
+
+# Create Python virtual environment
+echo "📦 Creating Python virtual environment..."
+python3 -m venv .venv
+
+# Activate virtual environment and install dependencies
+echo "📥 Installing Python dependencies..."
+source .venv/bin/activate
+python -m pip install --upgrade pip
+python -m pip install hatch
+hatch build
+
+# Install this package from local directory.
+pip install -e .
+
+# Create logs directory if it doesn't exist
+mkdir -p logs
+
+# Create optional data directories
+mkdir -p data
+
+# Create .env file if it doesn't exist
+if [ ! -f .env ]; then
+    echo "📝 Creating .env template..."
+    echo "# Optional: CodeQL database base path" >> .env
+    echo "CODEQL_DBS_BASE_PATH=$(realpath data)" >> .env
+    echo "⚠️  Please configure the environment or your .env file with required tokens!"
+fi
+
+echo "✅ Development environment setup complete!"