Ash-chromium update latest file

Update latest file on gcs.

Bug: 1109287
Change-Id: Ibcd6540a5ebfd838e2f31bf4e71fb56b516d083e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342636Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795988}

infra/config/generated/cr-buildbucket.cfg

@@ -10226,7 +10226,7 @@ buckets {
         cipd_version: "refs/heads/master"
         cmd: "recipes"
       }
-      properties: "{\"$build/archive\":{\"archive_datas\":[{\"archive_type\":\"ARCHIVE_TYPE_ZIP\",\"dirs\":[\"locales\",\"swiftshader\"],\"files\":[\"chrome\",\"chrome_100_percent.pak\",\"chrome_200_percent.pak\",\"crashpad_handler\",\"headless_lib.pak\",\"icudtl.dat\",\"libminigbm.so\",\"nacl_helper\",\"nacl_irt_x86_64.nexe\",\"resources.pak\",\"snapshot_blob.bin\"],\"gcs_bucket\":\"ash-chromium-on-linux-prebuilts\",\"gcs_path\":\"x86_64/{%position%}/ash-chromium.zip\"}]},\"$build/goma\":{\"enable_ats\":true,\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"},\"$kitchen\":{\"devshell\":true,\"git_auth\":true},\"mastername\":\"chromium.fyi\",\"recipe\":\"chromium\"}"
+      properties: "{\"$build/archive\":{\"archive_datas\":[{\"archive_type\":\"ARCHIVE_TYPE_ZIP\",\"dirs\":[\"locales\",\"swiftshader\"],\"files\":[\"chrome\",\"chrome_100_percent.pak\",\"chrome_200_percent.pak\",\"crashpad_handler\",\"headless_lib.pak\",\"icudtl.dat\",\"libminigbm.so\",\"nacl_helper\",\"nacl_irt_x86_64.nexe\",\"resources.pak\",\"snapshot_blob.bin\"],\"gcs_bucket\":\"ash-chromium-on-linux-prebuilts\",\"gcs_path\":\"x86_64/{%position%}/ash-chromium.zip\",\"latest_upload\":{\"gcs_file_content\":\"{%position%}\",\"gcs_path\":\"x86_64/latest/ash-chromium.txt\"}}]},\"$build/goma\":{\"enable_ats\":true,\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"},\"$kitchen\":{\"devshell\":true,\"git_auth\":true},\"mastername\":\"chromium.fyi\",\"recipe\":\"chromium\"}"
       execution_timeout_secs: 36000
       build_numbers: YES
       service_account: "chromium-ci-builder@chops-service-accounts.iam.gserviceaccount.com"

infra/config/subprojects/chromium/master-only/ci.star

@@ -1516,6 +1516,10 @@ ci.fyi_builder(
                     "gcs_bucket": "ash-chromium-on-linux-prebuilts",
                     "gcs_path": "x86_64/{%position%}/ash-chromium.zip",
                     "archive_type": "ARCHIVE_TYPE_ZIP",
+                    "latest_upload": {
+                        "gcs_path": "x86_64/latest/ash-chromium.txt",
+                        "gcs_file_content": "{%position%}",
+                    },
                 },
             ],
         },