Add Workbench smoke test CI workflow

[Copilot]

• Research how issue add smoke testing against a CI connect #2 (connect smoke testing) was implemented
• Create plans/workbench-ci-testing.md plan document
• Create .github/workflows/workbench-smoke.yml reusable workflow
• Fix workflow: correct Docker image tag format (ubuntu2204-2026.01.1 / ubuntu2204)
• Fix workflow: make stop step idempotent with || true

Original prompt

work on #9.

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[github-actions]

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[statik]

@copilot fix the workbench ci job

[Copilot]

@copilot fix the workbench ci job

Fixed in e419297. Two issues:

1. Wrong image tag: rstudio/rstudio-workbench:2024.09.0 doesn't exist on Docker Hub — the actual tag format is ubuntu2204-{version} (e.g. ubuntu2204-2024.09.1). There's also no daily tag; the rolling ubuntu2204 tag points to the latest release, so that's used for scheduled runs instead.

2. Fragile cleanup: docker stop workbench && docker rm workbench was failing in the if: always() step when the container never started. Added || true to make it idempotent.

[statik]

@copilot modify this to use 2026.01 as the workbench version.

[Copilot]

@copilot modify this to use 2026.01 as the workbench version.

Done in 6ee06e3. Updated to ubuntu2204-2026.01.1 (the correct Docker Hub tag for the 2026.01 release). The scheduled run still uses the mutable ubuntu2204 tag to track the latest release.