infra: add github action for stale issues (#150)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: File a report to help us reproduce and fix the problem
 title: ''
-labels: ''
+labels: 'bug'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/documentation_request.md

@@ -2,7 +2,7 @@
 name: Documentation request
 about: Request improved documentation
 title: ''
-labels: ''
+labels: 'documentation'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest new functionality for this library
 title: ''
-labels: ''
+labels: 'feature'
 assignees: ''
 
 ---

.github/workflows/stale_issue.yml

@@ -0,0 +1,47 @@
+name: "Close stale issues"
+
+# Controls when the action will run.
+# This is every day at 10am
+on:
+  schedule:
+    - cron: "0 10 * * *"
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    name: Stale issue job
+    steps:
+      - uses: aws-actions/stale-issue-cleanup@v3
+        with:
+          # Setting messages to an empty string will cause the automation to skip
+          # that category
+          ancient-issue-message: Greetings! It looks like this issue hasn’t been active in longer than three years. We encourage you to check if this is still an issue in the latest release. Because it has been longer than three years since the last update on this, and in the absence of more information, we will be closing this issue soon. If you find that this is still a problem, please feel free to provide a comment to prevent automatic closure, or if the issue is already closed, please feel free to reopen it.
+          stale-issue-message: Greetings! It looks like this issue hasn’t been active in longer than a week. We encourage you to check if this is still an issue in the latest release. Because it has been longer than a week since the last update on this, and in the absence of more information, we will be closing this issue soon. If you find that this is still a problem, please feel free to provide a comment or add an upvote to prevent automatic closure, or if the issue is already closed, please feel free to open a new one.
+          stale-pr-message: Greetings! It looks like this PR hasn’t been active in longer than a week, add a comment or an upvote to prevent automatic closure, or if the issue is already closed, please feel free to open a new one.
+
+          # These labels are required
+          stale-issue-label: closing-soon
+          exempt-issue-label: auto-label-exempt
+          stale-pr-label: closing-soon
+          exempt-pr-label: pr/needs-review
+          response-requested-label: response-requested
+
+          # Don't set closed-for-staleness label to skip closing very old issues
+          # regardless of label
+          closed-for-staleness-label: closed-for-staleness
+
+          # Issue timing
+          days-before-stale: 7
+          days-before-close: 4
+          days-before-ancient: 1095
+
+          # If you don't want to mark a issue as being ancient based on a
+          # threshold of "upvotes", you can set this here. An "upvote" is
+          # the total number of +1, heart, hooray, and rocket reactions
+          # on an issue.
+          minimum-upvotes-to-exempt: 1
+
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          loglevel: DEBUG
+          # Set dry-run to true to not perform label or close actions.
+          dry-run: false