Modify service Dockerfile as no longer require developer stage

Dockerfile

@@ -1,25 +1,13 @@
-# The devcontainer should use the developer target and run as root with podman
-# or docker with user namespaces.
 ARG PYTHON_VERSION=3.11
-FROM python:${PYTHON_VERSION} as developer
-
-# Add any system dependencies for the developer/build environment here
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    graphviz \
-    && rm -rf /var/lib/apt/lists/*
-
-# Set up a virtual environment and put it in PATH
-RUN python -m venv /venv
-ENV PATH=/venv/bin:$PATH
-
 # The build stage installs the context into the venv
-FROM developer as build
+FROM python:${PYTHON_VERSION} AS build
+RUN python -m venv /venv;
 COPY . /context
 WORKDIR /context
 RUN touch dev-requirements.txt && pip install --upgrade pip && pip install -c dev-requirements.txt .
 
 # The runtime stage copies the built venv into a slim runtime container
-FROM python:${PYTHON_VERSION}-slim as runtime
+FROM python:${PYTHON_VERSION}-slim AS runtime
 # Add apt-get system dependecies for runtime here if needed
 RUN apt-get update && apt-get install -y --no-install-recommends \
     # Git required for installing packages at runtime