Update Dockerfile to use python:3.13.11-alpine3.22

[Adarshkumar0509]

This pull request updates the Cornucopia Docker image to use Python 3.13.11 on Alpine 3.22, aligning with the request to upgrade to Python 3.13 and Ubuntu 25.04.

Changes:
Update the Dockerfile base image from python:3.12.12-alpine3.22 to python:3.13.11-alpine3.22.

Keep the rest of the Dockerfile and build process unchanged.

Rationale:
Ensures the project is built and tested against the latest Python 3.13.x release.

Reduces future upgrade work as Python 3.13 becomes the default in more environments.

Testing:

Built the Docker image locally with the updated base image.

Verified that the image builds successfully and the existing entrypoints remain functional.

Related PR: #2119 (ClusterFuzzLite configuration).

Fixes #2105

[sydseter]

you forgot to upgrade the fuzzers: https://github.com/OWASP/cornucopia/blob/master/.clusterfuzzlite/Dockerfile

[Adarshkumar0509]

Thanks for the review! I’ve now updated .clusterfuzzlite/Dockerfile to use the ubuntu-25-04 base image in a separate PR and referenced issue #2105 there as well.

[Adarshkumar0509]

hi @sydseter I tried updating .clusterfuzzlite/Dockerfile to use ubuntu-25-04 in #2119, but the image tag gcr.io/oss-fuzz-base/base-builder-python:ubuntu-25-04 does not exist yet, so the ClusterFuzzLite build fails. I’ve reverted it to the existing ubuntu-24-04 base image in #2119 to keep CI green, and will be happy to update it once a valid ubuntu-25-04 tag is available.

[sydseter]

Ok, then we need to install python 3.13 during the docker build here:

cornucopia/.clusterfuzzlite/Dockerfile

Line 2 in 3269f14

RUN apt-get update && apt-get install -y --no-install-recommends \

[Adarshkumar0509]

Hi @sydseter, thanks for the suggestion. I’ve updated .clusterfuzzlite/Dockerfile in #2119 to install and use Python 3.13 during the Docker build as you recommended, and the ClusterFuzzLite CI is now passing with this change.

[sydseter]

Please ensure the image is pinned with the correct hash.

[Adarshkumar0509]

I’ve updated the Dockerfile to pin python:3.13.11-alpine3.22 with digest sha256:2fd9…4045 and pushed the change, so the image is now correctly pinned.