chore: Add automation for stale issues and PRs

.github/workflows/issue-management-stale-action.yml

@@ -0,0 +1,59 @@
+---
+name: Issue management - run stale action
+
+on:
+  schedule:
+    # hourly at minute 23
+    - cron: "23 6 * * *"
+  workflow_dispatch:
+
+permissions: {}
+
+concurrency:
+  group: "stale-issues-and-prs"
+  cancel-in-progress: false
+
+jobs:
+  stale:
+    permissions:
+      contents: read
+      actions: write # because actions/stale deletes its old cache before saving new one
+      issues: write # for actions/stale to close stale issues
+      pull-requests: write # for actions/stale to close stale PRs
+    runs-on: ubuntu-latest
+    steps:
+      # Handle stale PRs
+      # - After 120 days inactive: Adds "stale" label + warning comment
+      # - After 30 more days inactive: Closes
+      - uses: actions/stale@b5d41d4e1d5dceea10e7104786b73624c18a190f # v10.2.0
+        with:
+          days-before-issue-stale: -1
+          days-before-issue-close: -1
+          days-before-pr-stale: 120
+          days-before-pr-close: 30
+          stale-pr-label: stale
+          stale-pr-message: >
+            This PR has been marked as stale due to 120 days of inactivity.
+            It will be automatically closed if there is no further activity over the next 30 days.
+          close-pr-message: >
+            This PR was automatically closed due to lack of activity after being marked stale. Feel
+            free to reopen if you would like to continue working on it.
+          operations-per-run: 1000
+
+      # Handle stale issues
+      # - After 360 days (12 months) inactive: Adds "stale" label + warning comment
+      # - After 30 more days inactive: Closes
+      - uses: actions/stale@b5d41d4e1d5dceea10e7104786b73624c18a190f # v10.2.0
+        with:
+          days-before-issue-stale: 360
+          days-before-issue-close: 30
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          stale-issue-label: stale
+          stale-issue-message: >
+            This issue has been marked as stale due to 12 months of inactivity.
+            It will be automatically closed if there is no further activity over the next 30 days.
+          close-issue-message: >
+            This issue was automatically closed due to lack of activity after being marked stale.
+            Feel free to reopen if you would like to continue working on it.
+          operations-per-run: 1000