feat: Update mainline NGINX to 1.29.1

[alessfg]

Proposed changes

This PR updates mainline NGINX to 1.29.1. It also updates NJS to 0.9.1 and adds the --batch flag to all gpg invocations.

Checklist

Before creating a PR, run through this checklist and mark each as complete:

• I have read the contributing guidelines
• I have signed the F5 Contributor License Agreement (CLA)
• I have run the update.sh script and ensured all entrypoint/Dockerfile template changes have been applied to the relevant image entrypoint scripts & Dockerfiles
• I have tested that the NGINX Docker unprivileged image builds and runs correctly on all supported architectures on an unprivileged environment (check out the README for more details)
• I have updated any relevant documentation (README.md)

[Copilot]

Pull Request Overview

This PR updates the mainline NGINX Docker images from version 1.29.0 to 1.29.1, along with updating NJS from 0.9.0 to 0.9.1. Additionally, it adds the --batch flag to GPG commands to improve non-interactive execution in Docker builds.

• Updates NGINX mainline version from 1.29.0 to 1.29.1
• Updates NJS version from 0.9.0 to 0.9.1
• Adds --batch flag to GPG commands for better non-interactive behavior

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
update.sh	Updates version definitions and package checksums for mainline NGINX and NJS
stable/debian/Dockerfile	Adds --batch flag to GPG commands
mainline/debian/Dockerfile	Updates NGINX/NJS versions, checksums, and adds --batch flag to GPG commands
mainline/debian-perl/Dockerfile	Updates base image version and package checksum
mainline/debian-otel/Dockerfile	Updates base image version and package checksum
mainline/alpine/Dockerfile	Updates base image version, NJS version, and package checksum
mainline/alpine-slim/Dockerfile	Updates NGINX version and package checksum
mainline/alpine-perl/Dockerfile	Updates base image version and package checksum
mainline/alpine-otel/Dockerfile	Updates base image version and package checksum
Dockerfile-debian.template	Adds --batch flag to GPG commands in the template

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[alessfg]

The build is failing due to how the pipeline works. Since the first builds in the sequence did succeed, the rest should work too once the images are actually pushed.