Problem: no CI in Debian

Solution: run with Debian container on GH

.github/workflows/Dockerfile-debian

+FROM debian:stable-slim as debian-python
+RUN apt-get update
+RUN apt-get install -y make gcc openssl libffi-dev curl zlib1g-dev libssl-dev
+ARG PYTHON_VER
+ENV LANG C.UTF-8
+RUN mkdir buildout
+WORKDIR /buildout
+COPY Makefile Makefile.configure /buildout/
+RUN make PYTHON_VER=${PYTHON_VER} download_python
+RUN make PYTHON_VER=${PYTHON_VER} python
+FROM debian-python
+ARG PYTHON_VER
+COPY doc /buildout/doc
+COPY src /buildout/src
+COPY zc.recipe.egg_ /buildout/zc.recipe.egg_
+COPY setup.* dev.py *.rst *.txt buildout.cfg /buildout/
+RUN make PYTHON_VER=${PYTHON_VER} build

.github/workflows/debian.yml

+name: Test in Debian container
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build container with Python ${{ matrix.python-version }}
+      env:
+        PYTHON_VER: ${{matrix.python-version}}
+      run: |
+        docker build -f .github/workflows/Dockerfile-debian --tag debian_buildout:python${PYTHON_VER} --build-arg PYTHON_VER=${PYTHON_VER} .
+    - name: Test
+      env:
+        PYTHON_VER: ${{matrix.python-version}}
+      run: |
+        docker run debian_buildout:python${PYTHON_VER} /buildout/bin/test -c -vvv