fix(helmv3): add --force-update when adding a repo

[gaelgatelement]

Changes

We add --force-update to overwrite any existing repo with the same name.

Context

When using renovate to update helm lock files in a monorepo, we encounter the following error when a helm chart is present in multiple Chart.yaml :

The artifact failure details are included below:

Command failed: helm repo add <name> <url>
Error: repository name (<name>) already exists, please specify a different name

Using --force-update works around this behaviour by overwriting any existing repo with the same name.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[CLAassistant]

All committers have signed the CLA.

[viceice]

Please sign the CLA, otherwise LGTM

[viceice]

needs cla signing

[gaelgatelement]

I signed the CLA.

[renovate-release]

🎉 This PR is included in version 37.126.3 🎉

The release is available on:

• GitHub release
• 37.126.3

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