ci: add lockthreads and stale actions (#306)

Author: timerring

.github/workflows/stale.yml

@@ -0,0 +1,52 @@
+name: 'Close stale and lock closed issues and PRs'
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '30 1 * * *'
+permissions:
+  contents: read
+jobs:
+  stale:
+    permissions:
+      issues: write
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@7de207be1d3ce97a9abe6ff1306222982d1ca9f9 # v5.0.1
+        with:
+          issue-inactive-days: 365 # 1 year
+          add-issue-labels: 'Outdated'
+          issue-comment: >
+            This issue has been automatically locked since there
+            has not been any recent activity after it was closed.
+            Please open a new issue for related bugs.
+          pr-comment: >
+            This pull request has been automatically locked since there
+            has not been any recent activity after it was closed.
+            Please open a new issue for related bugs.
+      - uses: actions/stale@28ca1036281a5e5922ead5184a1bbf96e5fc984e # v9.0.0
+        with:
+          operations-per-run: 999
+          days-before-issue-stale: 180 # 6 months
+          days-before-pr-stale: 180 # 6 months
+          days-before-issue-close: 180 # 6 months
+          days-before-pr-close: 180 # 6 months
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has not had
+            recent activity. The resources of team are limited, and so we are asking for your help.
+
+            If this is a **bug** and you can still reproduce this error on the <code>main</code> branch, please reply with all of the information you have about it in order to keep the issue open.
+
+            If this is a **feature request**, and you feel that it is still relevant and valuable, please tell us why.
+
+            This issue will automatically be closed in the near future if no further activity occurs. Thank you for all your contributions.
+          stale-pr-message: This PR has been automatically marked as stale because it has not had
+            recent activity. The resources of the team are limited, and so we are asking for your help.
+
+            Please check and verify that this code contribution fits with the purpose of the project. If yes, tell is in a comment.
+
+            This PR will automatically be closed in the near future if no further activity occurs. Thank you for all your contributions.
+          stale-issue-label: 'Stale'
+          exempt-issue-labels: 'Keep,Security'
+          stale-pr-label: 'Stale'
+          exempt-pr-labels: 'Keep,Security'