fix: skip chartify for build command jsonPatches (#2212)

The build command is intended to be a read-only inspection command that
outputs the helmfile state. However, when releases use jsonPatches,
strategicMergePatches, or transformers, the chart preparation step
triggers chartify, which runs helm template and requires dependencies to
be built.

This causes two issues:
1. helm template is executed unnecessarily for a simple state inspection
2. Missing chart dependencies cause errors even with SkipDeps enabled

This change modifies PrepareCharts to filter out releases that require
chartify when the command is "build". These releases are excluded from
chart preparation, preventing helm template from being invoked.

The state output will still include these releases, but their charts
won't be processed during the build operation.

Signed-off-by: Shane Starcher <shanestarcher@gmail.com>

pkg/state/state.go

@@ -1139,6 +1139,16 @@ func releasesNeedCharts(releases []ReleaseSpec) []ReleaseSpec {
 	return result
 }
 
+func filterReleasesForBuild(releases []ReleaseSpec) []ReleaseSpec {
+	var filteredReleases []ReleaseSpec
+	for _, r := range releases {
+		if len(r.JSONPatches) == 0 && len(r.StrategicMergePatches) == 0 && len(r.Transformers) == 0 {
+			filteredReleases = append(filteredReleases, r)
+		}
+	}
+	return filteredReleases
+}
+
 type ChartPrepareOptions struct {
 	ForceDownload bool
 	SkipRepos     bool
@@ -1237,6 +1247,12 @@ func (st *HelmState) PrepareCharts(helm helmexec.Interface, dir string, concurre
 
 	releases := releasesNeedCharts(selected)
 
+	// For build command, skip releases that require chartify (jsonPatches, etc.)
+	// as we only need to output state, not actually template the charts
+	if helmfileCommand == "build" {
+		releases = filterReleasesForBuild(releases)
+	}
+
 	var prepareChartInfoMutex sync.Mutex
 
 	prepareChartInfo := make(map[PrepareChartKey]string, len(releases))