[triage] contribute an issue triage github workflow

Change-Id: I9b4122bed37b2e4ef3b7c0dcc3c840ebfb2d5fc9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370160
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>
Reviewed-by: Nate Bosch <nbosch@google.com>

.github/workflows/issue-triage.yml

@@ -0,0 +1,38 @@
+# A workflow to invoke a triage automation bot.
+#
+# For more information, see
+# https://github.com/dart-lang/ecosystem/tree/main/pkgs/sdk_triage_bot and
+# https://github.com/dart-lang/sdk/blob/main/docs/Triaging-Dart-SDK-issues.md.
+
+name: Triage Bot
+
+# Run when an issue is created.
+on:
+  issues:
+    types:
+      - opened
+
+# All permissions not specified are set to 'none'.
+permissions:
+  issues: write
+
+jobs:
+  triage_issues:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
+        with:
+          repository: dart-lang/ecosystem
+
+      - uses: dart-lang/setup-dart@f0ead981b4d9a35b37f30d36160575d60931ec30
+
+      - run: dart pub get
+        working-directory: pkgs/sdk_triage_bot
+
+      - name: triage issue
+        working-directory: pkgs/sdk_triage_bot
+        env:
+          ISSUE_URL: ${{ github.event.issue.html_url }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GOOGLE_API_KEY: ${{ secrets.GEMINI_API_KEY }}
+        run: dart bin/triage.dart $ISSUE_URL --dry-run

docs/Triage-automation.md

@@ -1,3 +0,0 @@
-## What are the `@dart-github-bot` comments?
-
-We're experimenting with triage automation. You may see comments made by a `@dart-github-bot` - that's related to our automation investigations. We may or may not continue experimentation here; for now, you can safely ignore these comments.

docs/Triaging-Dart-SDK-issues.md

@@ -44,6 +44,16 @@ on an issue, say so, and consider adding the `needs-info` label to the issue. Is
 with a `needs-info` label are triaged by our [no response] bot; it will auto-close
 the issue after 14 days if the issue reporter does not respond.
 
+## Triage automation
+
+We're experimenting with triage automation. You may see comments made by a
+`@dart-github-bot` - that's related to our automation investigations. We may or
+may not continue experimentation here; for now, you can safely ignore these
+comments.
+
+For the source for the triage tool, see
+https://github.com/dart-lang/ecosystem/tree/main/pkgs/sdk_triage_bot.
+
 ## Follow up steps for Dart VM and Dart IO Library issues
 
 Issues filed against the Dart VM (issues with label `area-vm` : [VM issues](https://github.com/dart-lang/sdk/issues?q=is%3Aissue+is%3Aopen+label%3Aarea-vm+)) and IO library (issues with labels `area-core-library` `library-io` : [io library issues](https://github.com/dart-lang/sdk/issues?q=is%3Aissue+is%3Aopen+label%3Aarea-core-library+label%3Alibrary-io)) are triaged at least weekly by a member of the Dart VM team.