chore(github-actions): add action to close stale issues and PRs

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: 🐛 Bug report
 about: Create a report to help us improve Postal and fix issues.
 title: ''
-labels: bug
+labels: ''
 assignees: ''
 
 ---

.github/workflows/close.yml

@@ -0,0 +1,29 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+permissions:
+  issues: write
+  pull-requests: write
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          stale-pr-message: 'This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.'
+          close-issue-message: 'This issue was closed because it has been stalled for 5 days with no activity.'
+          close-pr-message: 'This PR was closed because it has been stalled for 10 days with no activity.'
+
+          stale-issue-label: stale
+          stale-pr-label: stale
+
+          days-before-issue-stale: 30
+          days-before-pr-stale: 45
+          days-before-issue-close: 5
+          days-before-pr-close: 10
+
+          exempt-all-assignees: true
+          exempt-all-milestones: true
+          exempt-issue-labels: bug,enhancement,bug,install,feature