ci: Update the Dockerfile to be useful for testing slapd-regtest.

Tested with `podman build .`

Issue: #98

Dockerfile

@@ -1,10 +1,18 @@
-FROM python:3
+FROM python:3.10
 RUN apt-get update
-RUN apt-get install -y libsasl2-dev libldap2-dev libssl-dev
-RUN mkdir /code
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get install -y libsasl2-dev libldap2-dev libssl-dev slapd ldap-utils
+
+ENV VIRTUAL_ENV=/opt/venv
+RUN python -m venv $VIRTUAL_ENV
+ENV PATH=$VIRTUAL_ENV/bin:$PATH
+
 WORKDIR /code
-ADD requirements.txt /code/
+
+ADD ./requirements.txt /code/requirements.txt
 RUN pip install -r requirements.txt
-ADD . /code/
 
-CMD [ "python", "./runtests.py" ]
+ADD . /code
+RUN python setup.py test
+RUN python setup.py install
+RUN tests/slapd-regtest

README.md

@@ -32,3 +32,9 @@ Issue history is at https://code.google.com/p/nsscache/issues/list
 # Contributions
 
 Please format your code with https://github.com/google/yapf (installable as `pip install yapf` or the `yapf3` package on Debian systems) before sending pull requests.
+
+# Testing
+
+The [`Dockerfile`](Dockerfile) sets up a container that then executes the python unit tests and [`tests/slapd-regtest`](tests/slapd-regtest) integration test.  Execute that with `podman build .` to get a reproducible test environment.
+
+The `Dockerfile` mimics the test environment used by the Github Actions workflow [`.github/workflows/ci.yml`](.github/workflows/ci.yml)