Added git hash as version number

cntmanage/docker/flightslot.Dockerfile

@@ -4,7 +4,6 @@ FROM python:3.12 AS builder
 # Install Poetry
 RUN curl -sSL https://install.python-poetry.org | python3 -
 ENV PATH="${PATH}:/root/.local/bin"
-RUN env
 # Create build directory
 WORKDIR /build
 # Copy project files
@@ -14,28 +13,26 @@ RUN poetry update --no-interaction --no-ansi
 # Build project
 RUN poetry build
 
-### STAGE 2 — Final image
+### STAGE 2 — Final image ###
 FROM python:3.12-slim AS deploy
-
+# Create app run directory
 WORKDIR /app
-
 # Copy application custom static files
 RUN mkdir -p static
 COPY ./static/cantorair.jpg ./static
 COPY ./static/cantorair_blue.jpg ./static
-
 # Copy application custom templates for admin page
 RUN mkdir -p /templates/admin
 COPY ./templates/admin/* ./templates/admin/
-
 # Copy and install application wheel package
 COPY --from=builder /build/dist/*.whl ./
 RUN pip install --no-cache-dir *.whl
 RUN pip install gunicorn whitenoise
-
 # Copy entryupoint bash script
 COPY ./docker/entrypoint.sh ./
+# Collect build number from build arg
+ARG GIT_HASH
+ENV VERSION=${GIT_HASH}
 ENTRYPOINT ["/app/entrypoint.sh"]
-
 # Command to be executed after entry point 
 CMD ["gunicorn", "cntmanage.wsgi:application", "--bind", "0.0.0.0:8000", "--timeout", "600"]