Add prior_stages: to release config

Include those paths in the inheritance graph.

Bug: 348495189
Test: manual
Merged-In: I993af3a34ab7dd9a3346c6ffccb17e7abff23545
Change-Id: I993af3a34ab7dd9a3346c6ffccb17e7abff23545

cmd/release_config/release_config_lib/util.go

@@ -22,6 +22,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"regexp"
+	"slices"
 	"strings"
 
 	"google.golang.org/protobuf/encoding/prototext"
@@ -159,6 +160,15 @@ func warnf(format string, args ...any) (n int, err error) {
 	return 0, nil
 }
 
+func SortedMapKeys(inputMap map[string]bool) []string {
+	ret := []string{}
+	for k := range inputMap {
+		ret = append(ret, k)
+	}
+	slices.Sort(ret)
+	return ret
+}
+
 func validContainer(container string) bool {
 	return containerRegexp.MatchString(container)
 }