build: track flaky tests for "nightly", add new secrets for tagging (#…

…530)

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Source-Link: googleapis/synthtool@8cf6d28

packages/google-privacy-dlp/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-dlp.git",
-        "sha": "a2430a7712c311f3cbca3fff8e9410cc621ced64"
+        "sha": "5792b5c4265e4ad1e0728e6a935de6fd94d3bb00"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "05de3e1e14a0b07eab8b474e669164dbd31f81fb"
+        "sha": "8cf6d2834ad14318e64429c3b94f6443ae83daf9"
       }
     }
   ],
@@ -42,7 +42,6 @@
     ".github/ISSUE_TEMPLATE/feature_request.md",
     ".github/ISSUE_TEMPLATE/support_request.md",
     ".github/PULL_REQUEST_TEMPLATE.md",
-    ".github/publish.yml",
     ".github/release-please.yml",
     ".github/workflows/ci.yaml",
     ".gitignore",