feat(stale): add stale (#15)

Author: TartanLeGrand

.github/workflows/stale.yml

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+name: Close stale issues and PRs
+
+on:
+  workflow_call:
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v9
+        with:
+          days-before-issue-stale: 30  # Marks issues as stale after 30 days of inactivity
+          days-before-issue-close: 7   # Closes stale issues after an additional 7 days
+          stale-issue-label: "stale"
+          stale-issue-message: "This issue has been automatically marked as stale due to inactivity."
+          days-before-pr-stale: 60     # Marks PRs as stale after 60 days of inactivity
+          days-before-pr-close: 14     # Closes stale PRs after an additional 14 days
+          stale-pr-label: "stale"
+          stale-pr-message: "This pull request has been automatically marked as stale due to inactivity."

stale/CHANGELOG.md

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+# Docker build
+
+## Example usage
+
+```yaml
+uses: iExecBlockchainComputing/github-actions-workflows/[email protected]
+```