Use new base images (#39)

* Convert Dockerfile to use new standard base images

* improve Dockerfile comments

* version set the base images

Dockerfile

@@ -1,46 +1,41 @@
+# Package path for this plugin module relative to the repo root
 ARG package=arcaflow_plugin_template_python
 
-# build poetry
-FROM quay.io/centos/centos:stream8 as poetry
+# STAGE 1 -- Build module dependencies and run tests
+# The 'poetry' and 'coverage' modules are installed and verson-controlled in the
+# quay.io/arcalot/arcaflow-plugin-baseimage-python-buildbase image to limit drift
+FROM quay.io/arcalot/arcaflow-plugin-baseimage-python-buildbase:0.1.0 as build
 ARG package
-RUN dnf -y module install python39 && dnf -y install python39 python39-pip
-
-WORKDIR /app
 
 COPY poetry.lock /app/
 COPY pyproject.toml /app/
 
-RUN python3.9 -m pip install poetry==1.4.2 \
- && python3.9 -m poetry config virtualenvs.create false \
- && python3.9 -m poetry install --without dev --no-root \
+# Convert the dependencies from poetry to a static requirements.txt file
+RUN python3.9 -m poetry install --without dev --no-root \
  && python3.9 -m poetry export -f requirements.txt --output requirements.txt --without-hashes
 
-# run tests
 COPY ${package}/ /app/${package}
 COPY tests /app/${package}/tests
 
 ENV PYTHONPATH /app/${package}
 WORKDIR /app/${package}
 
-RUN mkdir /htmlcov
-RUN python3.9 -m pip install coverage==7.2.7 \
- && python3.9 -m coverage run tests/test_${package}.py \
+# Run tests and return coverage analysis
+RUN python3.9 -m coverage run tests/test_${package}.py \
  && python3.9 -m coverage html -d /htmlcov --omit=/usr/local/*
 
 
-# final image
-FROM quay.io/centos/centos:stream8
+# STAGE 2 -- Build final plugin image
+FROM quay.io/arcalot/arcaflow-plugin-baseimage-python-osbase:0.1.0
 ARG package
-RUN dnf -y module install python39 && dnf -y install python39 python39-pip
-
-WORKDIR /app
 
-COPY --from=poetry /app/requirements.txt /app/
-COPY --from=poetry /htmlcov /htmlcov/
+COPY --from=build /app/requirements.txt /app/
+COPY --from=build /htmlcov /htmlcov/
 COPY LICENSE /app/
 COPY README.md /app/
 COPY ${package}/ /app/${package}
 
+# Install all plugin dependencies from the generated requirements.txt file
 RUN python3.9 -m pip install -r requirements.txt
 
 WORKDIR /app/${package}