feat: add helmchart updater

Signed-off-by: skuethe <56306041+skuethe@users.noreply.github.com>

internal/updater/helmchart.go

@@ -0,0 +1,35 @@
+package updater
+
+import (
+	"regexp"
+)
+
+// HelmChart creates an updater that modifies the version field in Chart.yaml files
+func HelmChart() Updater {
+	return helmchart{}
+}
+
+type helmchart struct{}
+
+func (h helmchart) Files() []string {
+	return []string{"Chart.yaml"}
+}
+
+func (h helmchart) CreateNewFiles() bool {
+	return false
+}
+
+func (h helmchart) Update(info ReleaseInfo) func(content string) (string, error) {
+	return func(content string) (string, error) {
+		// Regex to match ^version: ...$ with flexible whitespace in multiline mode
+		versionRegex := regexp.MustCompile(`(?m:^(version:\s*)\S*$)`)
+
+		// Check if the file contains a version field
+		if !versionRegex.MatchString(content) {
+			return content, nil
+		}
+
+		// Replace the version value while preserving the original formatting
+		return versionRegex.ReplaceAllString(content, `${1}`+info.Version), nil
+	}
+}