ci: use ubuntu-slim

[v1v]

See https://github.blog/changelog/2025-10-28-1-vcpu-linux-runner-now-available-in-github-actions-in-public-preview/

Requires rhysd/actionlint#585

What

Use ubuntu-slim

Why

Follow-ups

• slack/send
• elastic/active-branches

Use Python, but it's not installed in the slim, so let's install it and see whether we can move away from the request module and use the native support.

This will help with using slim images for those actions

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /run exhaustive tests : Run the exhaustive tests Buildkite pipeline.

[Copilot]

Pull Request Overview

This PR updates all GitHub Actions workflows to use the new ubuntu-slim runner instead of ubuntu-latest, following the announcement of the 1 vCPU Linux runner now available in GitHub Actions.

Key Changes:

• Migration from ubuntu-latest to ubuntu-slim across all workflow files

Reviewed Changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.github/workflows/test-version-framework.yml	Updated runner to ubuntu-slim
.github/workflows/test-updatecli-run.yml	Updated multiple job runners to ubuntu-slim
.github/workflows/test-updatecli-install.yml	Updated runner to ubuntu-slim
.github/workflows/test-slack-send.yml	Updated runner to ubuntu-slim
.github/workflows/test-slack-notify-result.yml	Updated runner to ubuntu-slim
.github/workflows/test-pre-commit.yml	Updated runner to ubuntu-slim
.github/workflows/test-oblt-cli-undeploy-my-kibana.yml	Updated runner to ubuntu-slim
.github/workflows/test-oblt-cli-setup.yml	Updated runner to ubuntu-slim
.github/workflows/test-oblt-cli-deploy-my-kibana.yml	Updated runner to ubuntu-slim
.github/workflows/test-oblt-cli-cluster-name-validation.yml	Updated runner to ubuntu-slim
.github/workflows/test-oblt-cli-cluster-create-serverless.yml	Updated runner to ubuntu-slim
.github/workflows/test-oblt-cli-cluster-create-custom.yml	Updated runner to ubuntu-slim
.github/workflows/test-oblt-cli-cluster-create-ccs.yml	Updated runner to ubuntu-slim
.github/workflows/test-github-user-type.yml	Updated runner to ubuntu-slim
.github/workflows/test-github-project-field-set.yml	Updated runner to ubuntu-slim
.github/workflows/test-github-project-add.yml	Updated runner to ubuntu-slim
.github/workflows/test-github-is-pr-author-member-of.yml	Updated runner to ubuntu-slim
.github/workflows/test-github-is-member-of.yml	Updated runner to ubuntu-slim
.github/workflows/test-github-comment-reaction.yml	Updated runner to ubuntu-slim and renamed job from 'comment' to 'test'
.github/workflows/test-github-changed-files.yml	Updated runner to ubuntu-slim
.github/workflows/test-github-backport-active.yml	Updated runner to ubuntu-slim
.github/workflows/test-git-setup.yml	Updated runner to ubuntu-slim
.github/workflows/test-feature-freeze.yml	Updated runner to ubuntu-slim
.github/workflows/test-elastic-validate-catalog.yml	Updated runner to ubuntu-slim
.github/workflows/test-elastic-github-commands.yml	Updated runner to ubuntu-slim
.github/workflows/test-elastic-active-branches.yml	Updated multiple job runners to ubuntu-slim
.github/workflows/test-check-dependent-jobs.yml	Updated multiple job runners to ubuntu-slim, with one incorrect change
.github/workflows/test-buildkite-run.yml	Updated runner to ubuntu-slim
.github/workflows/required-labels.yml	Updated runner to ubuntu-slim
.github/workflows/release-drafter.yml	Updated runner to ubuntu-slim
.github/workflows/no-test.yml	Updated runner to ubuntu-slim
.github/workflows/create-major-tag.yml	Updated runner to ubuntu-slim

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /run exhaustive tests : Run the exhaustive tests Buildkite pipeline.

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /run exhaustive tests : Run the exhaustive tests Buildkite pipeline.

[Copilot]

Pull Request Overview

Copilot reviewed 31 out of 31 changed files in this pull request and generated 1 comment.

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /run exhaustive tests : Run the exhaustive tests Buildkite pipeline.

[Copilot]

Pull Request Overview

Copilot reviewed 31 out of 31 changed files in this pull request and generated no new comments.

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /run exhaustive tests : Run the exhaustive tests Buildkite pipeline.

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /run exhaustive tests : Run the exhaustive tests Buildkite pipeline.

[Copilot]

Pull Request Overview

Copilot reviewed 32 out of 32 changed files in this pull request and generated 1 comment.

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /run exhaustive tests : Run the exhaustive tests Buildkite pipeline.

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /run exhaustive tests : Run the exhaustive tests Buildkite pipeline.

[Copilot]

Pull Request Overview

Copilot reviewed 32 out of 32 changed files in this pull request and generated no new comments.

[fr4nc1sc0-r4m0n]

LGTM