Add troubleshooting about go caches

[SirSpidey]

Description

Addresses an issue when the Go build cache causes errors.

Internally, you can see the output as built at https://pages.github.ibm.com/allen-dean/tim-docs/#/ts-go-cache.

Types of changes in this PR

Changes that affect the core Terraform module or submodules

• Bug fix
• New feature
• Dependency update

Changes that don't affect the core Terraform module or submodules

• Examples or tests (addition or updates of examples or tests)
• Documentation update
• CI-related update (pipeline, etc.)
• Other

Release required?

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• No release
• Patch release (x.x.X)
• Minor release (x.X.x)
• Major release (X.x.x)

Release notes content

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Checklist for reviewers

• If relevant, a test for the change is included or updated with this PR.
• If relevant, documentation for the change is included or updated with this PR.

Merge actions for mergers

• Use a relevant conventional commit message that is based on the PR contents and any release notes provided by the PR author. The commit message determines whether a new version of the module is needed, and if so, which semver increment to use (major, minor, or patch).
• Merge by using "Squash and merge".