dockerfile for tests

Author: LucaMarconato

test.Dockerfile

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+# Dockerfile for Testing Plot Correctness
+#
+# This Dockerfile is used to create a consistent testing environment for
+# verifying the correctness of plot outputs against ground truth images.
+# The ground truth images are stored in `tests/_images` and are generated
+# using a GitHub Action on Ubuntu. This ensures consistency across different
+# environments, as local differences in OS or library versions can cause
+# slight variations in plot rendering (e.g., ticks or padding).
+
+# Define a build argument for the target platform.
+# Default is set to linux/amd64 for x86_64 machines.
+ARG TARGETPLATFORM=linux/amd64
+
+# Use the specified platform to pull the correct base image.
+# Override TARGETPLATFORM during build for different architectures, such as linux/arm64 for Apple Silicon.
+# For example, to build for ARM64 architecture (e.g., Apple Silicon),
+# use the following command on the command line:
+#
+#     docker build --build-arg TARGETPLATFORM=linux/arm64 -t my-arm-image .
+#
+# Similarly, to build for the default x86_64 architecture, you can use:
+#
+#     docker build --build-arg TARGETPLATFORM=linux/amd64 -t my-amd64-image .
+#
+FROM --platform=$TARGETPLATFORM ubuntu:latest
+LABEL authors="Luca Marconato"
+
+ENV PYTHONUNBUFFERED=1
+ENV MPLBACKEND=agg
+
+WORKDIR /spatialdata-plot
+COPY . /spatialdata-plot
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    build-essential \
+    python3-venv \
+    python3-dev \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN python3 -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+RUN pip install --upgrade pip wheel
+
+RUN pip install -e ".[dev,test]"
+
+CMD ["pytest", "-v", "tests/pl/test_render.py"]