CI: fix build-docker-args task

[aramprice]

Pipeline already reconfigured.

Fixes:

cat: /tmp/build/9ff7fd89/bosh-linux-stemcell-builder/.ruby-version: No such file or directory

^ https://bosh.ci.cloudfoundry.org/teams/stemcell/pipelines/ubuntu-jammy-builder/jobs/build-os-image-stemcell-builder/builds/47#L69ba6d7d:128

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: c30712af-f592-40cb-8361-ba7cb7e9b427

📥 Commits

Reviewing files that changed from the base of the PR and between b62f580 and 506c962.

📒 Files selected for processing (3)

• ci/pipelines/builder.yml
• ci/pipelines/vars.yml
• ci/tasks/build-docker-args.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-build-docker-args

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[Copilot]

Pull request overview

Updates the Concourse CI pipeline/task wiring so the build-docker-args task can reliably read the repository’s Ruby version, fixing the missing .ruby-version file error during the docker image build.

Changes:

• Read Ruby version from ${REPO_ROOT}/.ruby-version in build-docker-args.sh (instead of a hardcoded nested repo path).
• Update the bosh-stemcells-ci git resource paths filter to include .ruby-version so it’s present in the task input.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ci/tasks/build-docker-args.sh	Switches Ruby version lookup to the checked-out repo root, avoiding missing nested path.
ci/pipelines/builder.yml	Ensures .ruby-version is fetched into the bosh-stemcells-ci resource used by the task.

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