internal/helm: ErrChartReference on local load err

If a local reference does not contain a path to a valid file, returning
`ErrChartReference` is more correct to signal the reference is invalid.

This also indirectly causes the reconciler to signal a Suspend, as the
source or resource requires a change before a reattempt might be
successful.

Signed-off-by: Hidde Beydals <hello@hidde.co>

internal/helm/chart/builder_local.go

@@ -77,10 +77,10 @@ func (b *localChartBuilder) Build(ctx context.Context, ref Reference, p string,
 	// to a chart
 	curMeta, err := LoadChartMetadata(localRef.Path)
 	if err != nil {
-		return nil, &BuildError{Reason: ErrChartPull, Err: err}
+		return nil, &BuildError{Reason: ErrChartReference, Err: err}
 	}
 	if err = curMeta.Validate(); err != nil {
-		return nil, &BuildError{Reason: ErrChartPull, Err: err}
+		return nil, &BuildError{Reason: ErrChartReference, Err: err}
 	}
 
 	result := &Build{}