feat: bump dockerfile base image (#15)

Bump dockerfile base image to 3.13-slim.

Dockerfile

@@ -1,40 +1,37 @@
 # ------ common build args ------ #
-ARG PYTHON_VERSION=3.11.7
-ARG PYTHON_BASE_VER=slim-bookworm
+ARG PYTHON_VERSION=3.13
+ARG PYTHON_BASE_VER=slim
 ARG PYTHON_VENV=/venv
 
 #
 # ------ prepare venv ------ #
 #
-FROM python:${PYTHON_VERSION}-${PYTHON_BASE_VER} as venv_builder
+FROM python:${PYTHON_VERSION}-${PYTHON_BASE_VER} AS venv_builder
 
 ARG PYTHON_VENV
 
-COPY ./src ./pyproject.toml /source_code
+COPY ./src ./pyproject.toml /source_code/
 
 # ------ install build deps ------ #
 RUN set -eux; \
 	apt-get update ; \
 	apt-get install -y --no-install-recommends \
-		python3-dev \
+		gcc \
+		git \
 		libcurl4-openssl-dev \
 		libssl-dev \
-		gcc \
-		git
-
-# ------ setup virtual env and build ------ #
-RUN set -eux ; \
+		python3-dev; \
+	apt-get clean; \
+	# ------ setup virtual env and build ------ #
 	python3 -m venv ${PYTHON_VENV} ; \
 	. ${PYTHON_VENV}/bin/activate ; \
 	export PYTHONDONTWRITEBYTECODE=1 ; \
 	cd /source_code ;\
 	python3 -m pip install -U pip ; \
-	python3 -m pip install .
-
-# ------ post installation, cleanup ------ #
-# cleanup the python venv again
-# see python-slim Dockerfile for more details
-RUN set -eux ; \
+	python3 -m pip install . ;\
+	# ------ post installation, cleanup ------ #
+	# cleanup the python venv again
+	# see python-slim Dockerfile for more details
 	find ${PYTHON_VENV} -depth \
 			\( \
 				\( -type d -a \( -name test -o -name tests -o -name idle_test \) \) \
@@ -59,10 +56,9 @@ RUN set -eux ; \
 	rm -rf \
 		/var/lib/apt/lists/* \
 		/root/.cache \
-		/tmp/*
-
-# add mount points placeholder
-RUN mkdir -p /opt /greengrass
+		/tmp/* ;\
+	# add mount points placeholder
+	mkdir -p /opt /greengrass
 
 ENV PATH="${PYTHON_VENV}/bin:${PATH}"