fix: include VERSION file in Docker build

Docker build failed because pyproject.toml requires
a VERSION file that was not copied into the build context.

Author: Patel230

Dockerfile

@@ -1,7 +1,7 @@
 FROM python:3.12-slim AS builder
 
 WORKDIR /build
-COPY pyproject.toml ./
+COPY pyproject.toml VERSION ./
 RUN pip install --no-cache-dir build
 
 COPY src/ src/