feat(with-uv:3.12-alpine): ✨ Create new image.

Create new `with-uv:3.12-alpine` image, restructure the folders, create a pushing script to make things easier.

dockerfiles/with-uv/3.12-alpine/Dockerfile

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+FROM python:3.12-alpine
+
+RUN pip install uv
+
+ENTRYPOINT [ "python3", "-m", "uv", "run", "--no-dev" ]

dockerfiles/with-uv/3.13.2-alpine/Dockerfile

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+FROM python:3.13.2-alpine
+
+RUN pip install uv
+
+ENTRYPOINT [ "python3", "-m", "uv", "run", "--no-dev" ]

dockerfiles/with-uv/USAGE.md

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+# Usage
+
+To optimize the building and pushing of your images, use the following template:
+
+```dockerfile
+# Use the image and tag you need.
+FROM registry.nyeki.dev/docker/python/with-uv:3.13.2-alpine
+
+# Only copy uv-related files, necessary for syncing and caching.
+WORKDIR /app
+COPY pyproject.toml uv.lock /app/
+
+# Run with --no-dev on not to install dev dependencies.
+RUN python3 -m uv sync --no-dev
+
+# Copy the rest of your app.
+COPY . /app/
+
+# The ENTRYPOINT is set to `uv run --no-dev` by default, so only put your app's src directory as
+# the command.
+CMD [ "your_app" ]
+```