Handle RepoMappingManifest actions

These are essentially FileWrite actions, like SourceSymlinkManifest.

However, currently aquery appears to give non-deterministic results
for the file content. Emit an empty file for now to avoid the
non-determinism.

Fixes: 288292933
Bug: 287539324
Test: Presubmits
Change-Id: Ieaf8aff0d58d2d69087e4e34dc99074a015e700c
diff --git a/bazel/aquery.go b/bazel/aquery.go
index 95e52ae..480158c 100644
--- a/bazel/aquery.go
+++ b/bazel/aquery.go
@@ -677,7 +677,7 @@
 		if len(actionEntry.Arguments) < 1 {
 			return a.templateExpandActionBuildStatement(actionEntry)
 		}
-	case "FileWrite", "SourceSymlinkManifest":
+	case "FileWrite", "SourceSymlinkManifest", "RepoMappingManifest":
 		return a.fileWriteActionBuildStatement(actionEntry)
 	case "SymlinkTree":
 		return a.symlinkTreeActionBuildStatement(actionEntry)