feat(mongodb-runner): get the SLS tag from the manifest file by default

[autarch]

Description

When running a DSC cluster, the tag to use for the SLS repo is read by default from a manifest.json in the same directory as the required compose file. This is a file in the Server repo that is part of the Server's testing infrastructure for DSC clusters. Other projects can re-use these files for their own test (which we do in mongosync and the DB Tools).

If --slsImageTag is passed, then the runner will not attempt to read the manifest, so this doesn't change the behavior of any existing integrations.

Checklist

• I have signed the Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)
• New tests and/or benchmarks are included
• Documentation is changed or added

[Copilot]

Copilot review overview

🟡 Changes recommended

The central compose-to-manifest defaulting behavior lacks direct test coverage.

Review effort: Balanced
Findings: 1

Open (1)

• Add tests for default image tag resolution · New

What changed in this PR

Defaults SLS image tags from the manifest adjacent to the compose file.

Changes:

• Adds manifest parsing and default tag resolution.
• Makes --slsImageTag optional.
• Adds fixtures, tests, and documentation.

File	Description
packages/​mongodb-runner/​src/​sls.ts	Implements manifest-based tag resolution.
packages/​mongodb-runner/​src/​sls.spec.ts	Tests manifest parsing and errors.
packages/​mongodb-runner/​src/​index.ts	Exports the manifest reader.
packages/​mongodb-runner/​src/​cli.ts	Makes the CLI tag optional.
packages/​mongodb-runner/​docs/​disaggregated-storage.md	Documents automatic tag selection.
packages/​mongodb-runner/​test/​fixtures/​sls/​complete/​manifest.json	Adds a valid manifest fixture.
packages/​mongodb-runner/​test/​fixtures/​sls/​no-key/​manifest.json	Adds a missing-key fixture.
packages/​mongodb-runner/​test/​fixtures/​sls/​malformed/​manifest.json	Adds an invalid JSON fixture.
packages/​mongodb-runner/​.prettierignore	Excludes the malformed fixture.
.prettierignore	Excludes the malformed fixture globally.

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[dudaschar]

Hi, the check step is failing with @mongodb-js/mongodb-runner: D:\a\devtools-shared\devtools-shared\packages\mongodb-runner\src\sls.spec.ts @mongodb-js/mongodb-runner: 49:1 error The number of top-level suites is more than 1 mocha/max-top-level-suites Could you take a look on it, please?

[autarch]

Hi, the check step is failing with @mongodb-js/mongodb-runner: D:\a\devtools-shared\devtools-shared\packages\mongodb-runner\src\sls.spec.ts @mongodb-js/mongodb-runner: 49:1 error The number of top-level suites is more than 1 mocha/max-top-level-suites Could you take a look on it, please?

This should be fixed now.