Bump alpine to 3.23, add platforms to docker-dryrun

[silverwind]

• Bump alpine to 3.23 following Bump alpine to 3.23 #36185 and Revert "Bump alpine to 3.23 (#36185)" #36202.
• Enable all architectures in docker-dryrun.
• Tweak actions conditions to be more precise.

[silverwind]

I've now added the platforms to docker-dryun, same es in the release build, so these two docker builds should now do the exact same builds.

gitea/.github/workflows/release-nightly.yml

Lines 115 to 122 in 12a81d3

	- name: build regular docker image
	uses: docker/build-push-action@v6
	with:
	context: .
	platforms: linux/amd64,linux/arm64,linux/riscv64
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	annotations: ${{ steps.meta.outputs.annotations }}

[silverwind]

BTW docker-dryrun is quite slow after this change (99minutes), but it's definitely necessary.

I think I can refactor the actions code that it only runs when Dockerfiles are modified, keeping the slowness impact to a minimum.

[silverwind]

Did a small tweak so that pull-docker-dryrun does not trigger for any actions file modified, only for itself or the release ones.

I think ideally we remove pull-docker-dryrun and alter the release pipelines to do everything except pushing any files, but that's something for another time.

[Copilot]

Pull request overview

This PR bumps the Alpine Linux version from 3.22 to 3.23 in the Dockerfiles and enhances the docker-dryrun CI workflow to build for multiple platforms (amd64, arm64, riscv64). This is a retry of previous attempts (#36185, #36202) that failed due to riscv64 build issues. The goal is to catch such platform-specific failures during PR validation rather than in the main branch.

Changes:

• Updated Alpine base images from 3.22 to 3.23 in both Dockerfile and Dockerfile.rootless
• Added multi-platform builds (linux/amd64, linux/arm64, linux/riscv64) to docker-dryrun workflow
• Updated files-changed workflow to trigger docker builds when docker-related workflow files change

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
Dockerfile	Bumped golang builder and runtime images to alpine3.23
Dockerfile.rootless	Bumped golang builder and runtime images to alpine3.23
.github/workflows/pull-docker-dryrun.yml	Added multi-platform builds and refined trigger conditions
.github/workflows/files-changed.yml	Added docker-related workflow files to docker filter

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[silverwind]

@techknowlogick care to review?