Separate Dockerfile for devcontainer

- Debian based (python3.11-bookworm)
- Install essential system packages

.devcontainer/Dockerfile

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+# Dockerfile for the InvenTree devcontainer
+
+# In contrast with the "production" image (which is based on an Alpine image)
+# we use a Debian-based image for the devcontainer
+
+FROM mcr.microsoft.com/devcontainers/python:3.11-bookworm
+
+# InvenTree paths
+ENV INVENTREE_HOME="/home/inventree"
+ENV INVENTREE_DATA_DIR="${INVENTREE_HOME}/dev"
+ENV INVENTREE_STATIC_ROOT="${INVENTREE_DATA_DIR}/static"
+ENV INVENTREE_MEDIA_ROOT="${INVENTREE_DATA_DIR}/media"
+ENV INVENTREE_BACKUP_DIR="${INVENTREE_DATA_DIR}/backup"
+ENV INVENTREE_PLUGIN_DIR="${INVENTREE_DATA_DIR}/plugins"
+
+ENV INVENTREE_DOCKER="true"
+
+COPY contrib/container/init.sh ./
+RUN chmod +x init.sh
+
+# Install required base packages
+RUN apt update && apt install -y \
+   python3.11-dev python3.11-venv \
+   libldap2-dev libsasl2-dev \
+   libpango1.0-0 libcairo2 \
+   weasyprint
+
+# Install python database connectors
+
+ENTRYPOINT ["/bin/bash", "./init.sh"]