fix(install): support case when repo is already cloned

[thomasboni]

No description provided.

[cursor]

PR Summary

Low Risk
Low risk: small installer logic change to reuse/update an existing clone, plus a Helm chart version bump; main risk is unintended behavior if the existing directory is not a valid git repo.

Overview
Improves install.sh so rerunning the installer no longer fails when plumber-platform already exists: it now cds into the directory and attempts a fast-forward git pull instead of always cloning, and updates the success messaging accordingly.

Bumps the Helm chart version/appVersion in charts/plumber/Chart.yaml from 1.0.3 to 1.0.4.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Silent git pull failure shows misleading success message

Medium Severity

git pull --ff-only || true silently swallows all failures — including the case where the directory isn't actually a git repo, the remote is unreachable, or branches have diverged — and the script then prints a green "✓ Repository ready" message. The user has no indication the update failed and may proceed with stale or incorrect files. Since subsequent steps depend on repo contents (scripts/preflight.sh, versions.env), this can cause confusing downstream failures.

Additional Locations (1)

• install.sh#L185-L186