build: Add generate-files-bot config (#950)

* build: Add `generate-files-bot` config

Source-Author: Daniel Bankhead <dan@danielbankhead.com>
Source-Date: Tue Apr 27 15:33:07 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 04573fd73f56791c659832aa84d35a4ec860d6f7
Source-Link: googleapis/synthtool@04573fd

* build(node): switch $default-branch with template variable

Source-Author: Benjamin E. Coe <bencoe@google.com>
Source-Date: Tue Apr 27 15:41:40 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: e6f3d54be015a394b6ab5a25903ec09062a2b424
Source-Link: googleapis/synthtool@e6f3d54

.github/generated-files-bot.yml

@@ -0,0 +1,13 @@
+generatedFiles:
+- path: '.kokoro/**'
+  message: '`.kokoro` files are templated and should be updated in [`synthtool`](https://github.com/googleapis/synthtool)'
+- path: '.github/CODEOWNERS'
+  message: 'CODEOWNERS should instead be modified via the `codeowner_team` property in .repo-metadata.json'
+- path: '.github/workflows/**'
+  message: '`.github/workflows` (GitHub Actions) should be updated in [`synthtool`](https://github.com/googleapis/synthtool)'
+- path: '.github/generated-files-bot.+(yml|yaml)'
+  message: '`.github/generated-files-bot.(yml|yaml)` should be updated in [`synthtool`](https://github.com/googleapis/synthtool)'
+- path: 'README.md'
+  message: '`README.md` is managed by [`synthtool`](https://github.com/googleapis/synthtool). However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/master/.readme-partials.yaml'
+- path: 'samples/README.md'
+  message: '`samples/README.md` is managed by [`synthtool`](https://github.com/googleapis/synthtool). However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/master/.readme-partials.yaml'

.github/workflows/ci.yaml

@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - $default-branch
+      - master
   pull_request:
 name: ci
 jobs:

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-bigquery.git",
-        "sha": "4e69bae0fb76cf7df16ddd76c1424011e1a439e6"
+        "sha": "5e87d2277a83cdc88668772b496c69411b8bbaa9"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "c6706ee5d693e9ae5967614170732646590d8374"
+        "sha": "e6f3d54be015a394b6ab5a25903ec09062a2b424"
       }
     }
   ]