CI: Parameterize Python version in cross-arch Dockerfile

The python version in the Dockerfile for the arm64 cross-arch
tests is now parameterized to pass the python version as an
argument so that only one Dockerfile is needed for all python
versions.

Signed-off-by: Daniel Zullo <[email protected]>

Author: daniel-zullo-frequenz

.github/containers/nox-cross-arch/arm64-ubuntu-20.04-python-3.12.Dockerfile

@@ -5,9 +5,11 @@
 
 FROM docker.io/library/ubuntu:20.04
 
+ARG PYTHON_VERSION="3.11"
+
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Install Python 3.11 and curl to install pip later
+# Install Python and curl to install pip later
 RUN apt-get update -y && \
     apt-get install --no-install-recommends -y \
         software-properties-common && \
@@ -16,16 +18,16 @@ RUN apt-get update -y && \
         ca-certificates \
         curl \
         git \
-        python3.11 \
-        python3.11-distutils && \
+        python${PYTHON_VERSION} \
+        python${PYTHON_VERSION}-distutils && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
 # Install pip
-RUN curl -sS https://bootstrap.pypa.io/get-pip.py | python3.11
+RUN curl -sS https://bootstrap.pypa.io/get-pip.py | python${PYTHON_VERSION}
 
 RUN update-alternatives --install \
-        /usr/local/bin/python python /usr/bin/python3.11 1 && \
+        /usr/local/bin/python python /usr/bin/python${PYTHON_VERSION} 1 && \
     python -m pip install --upgrade --no-cache-dir pip
 
 COPY entrypoint.bash /usr/bin/entrypoint.bash

…rm64-ubuntu-20.04-python-3.11.Dockerfile …rch/arm64-ubuntu-20.04-python.Dockerfile.github/containers/nox-cross-arch/arm64-ubuntu-20.04-python-3.11.Dockerfile renamed to .github/containers/nox-cross-arch/arm64-ubuntu-20.04-python.Dockerfile .github/containers/nox-cross-arch/arm64-ubuntu-20.04-python-3.11.Dockerfile renamed to .github/containers/nox-cross-arch/arm64-ubuntu-20.04-python.Dockerfile

@@ -146,8 +146,10 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .github/containers/nox-cross-arch
-          file: .github/containers/nox-cross-arch/${{ matrix.arch }}-${{ matrix.os }}-python-${{ matrix.python }}.Dockerfile
+          file: .github/containers/nox-cross-arch/${{ matrix.arch }}-${{ matrix.os }}-python.Dockerfile
           platforms: linux/${{ matrix.arch }}
+          build-args: |
+            PYTHON_VERSION=${{ matrix.python }}
           tags: localhost/nox-cross-arch:latest
           push: false
           load: true