Added Docker/Podman build information.

Dockerfile

@@ -0,0 +1,13 @@
+FROM python:3.13-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+
+RUN pip install --root-user-action=ignore --no-cache-dir -r requirements.txt
+
+COPY image-chooser.py .
+COPY ./entrypoint.sh /
+
+ENTRYPOINT [ "/entrypoint.sh" ]
+CMD [ "run", "image-chooser.py" ]