[csandanov]

Problem

Python applications cannot select Python 3.15 in the service catalog.

Cause

The service only declares Python 3.10–3.14 images.

Solution

Offer Python 3.15 as an opt-in version with matching production and development images that follow the Python 3.15 line. Keep Python 3.14 as the default and preserve all existing version choices.

Implementation

• Add Python 3.15 with an October 2031 end-of-life date.
• Select the published 3.15-r6 and 3.15-dev-r6 image pair, using the same version family as the service option.
• Update the documented version list.

Validation

• Verified both revision tags are published for amd64 and arm64 and match the released image digests.
• Local schema and resolved inheritance checks passed for Python, Django, Flask, and FastAPI, including workspace settings and the unchanged 3.14 default.
• Checked the current service updater selects the 3.15 line and advances to a simulated next revision only when its matching development tag is available.
• Python, Flask, and FastAPI boilerplate tests passed on Python 3.15.1.

Rollout

The images are published in r6. Publish the Python service as 1.2.0 before publishing the inherited service updates. Connected-server manifest validation was not run; validation used the local import logic.

Inherited service changes: Django, Flask, and FastAPI.