(feat): Allow inform release go module version for external apis

Author: camilamacedo86

pkg/plugins/golang/repository.go

@@ -29,6 +29,7 @@ import (
 // module and goMod arg just enough of the output of `go mod edit -json` for our purposes
 type goMod struct {
 	Module module
+	Go     string
 }
 type module struct {
 	Path string
@@ -91,3 +92,32 @@ func FindCurrentRepo() (string, error) {
 	defer os.Remove("go.mod") // clean up after ourselves
 	return findGoModulePath()
 }
+
+// GetGoVersion returns the Go version from go.mod.
+func GetGoVersion() (string, error) {
+	cmd := exec.Command("go", "mod", "edit", "-json")
+	cmd.Env = append(cmd.Env, os.Environ()...)
+	out, err := cmd.Output()
+	if err != nil {
+		var exitErr *exec.ExitError
+		if errors.As(err, &exitErr) {
+			err = fmt.Errorf("%s", string(exitErr.Stderr))
+		}
+		return "", err
+	}
+	mod := goMod{}
+	if err = json.Unmarshal(out, &mod); err != nil {
+		return "", fmt.Errorf("failed to unmarshal go.mod: %w", err)
+	}
+	return mod.Go, nil
+}
+
+// SetGoVersion sets the Go version in go.mod.
+func SetGoVersion(version string) error {
+	cmd := exec.Command("go", "mod", "edit", "-go="+version)
+	cmd.Env = append(cmd.Env, os.Environ()...)
+	if out, err := cmd.CombinedOutput(); err != nil {
+		return fmt.Errorf("failed to set go version: %s: %w", string(out), err)
+	}
+	return nil
+}