[FIX] Move stale job definition to template project

[Github fails if the job definition is a symlink][1], whereas copier
copies it fine to the destination, so invert the symlink.

[1]: https://github.com/OCA/oca-addons-repo-template/actions/runs/1193365840

.github/workflows/stale.yml

@@ -0,0 +1,74 @@
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+    - cron: "0 12 * * 0"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      # 120+30 day stale policy for PRs
+      # * Except PRs marked as "no stale"
+      - name: Stale PRs policy
+        uses: actions/stale@v4
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          exempt-pr-labels: "no stale"
+          days-before-stale: 120
+          days-before-close: 30
+          days-before-issue-stale: -1
+          days-before-issue-close: -1
+          remove-stale-when-updated: true
+          stale-pr-label: "stale"
+          stale-pr-message: >
+            There hasn't been any activity on this pull request in the past 4 months, so
+            it has been marked as stale and it will be closed automatically if no
+            further activity occurs in the next 30 days.
+
+            If you want this PR to never become stale, please ask a PSC member to apply
+            the "no stale" label.
+
+      # 180+30 day stale policy for open issues
+      # * Except Issues marked as "no stale"
+      - name: Stale Issues policy
+        uses: actions/stale@v4
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          exempt-issue-labels: "no stale,needs more information"
+          days-before-stale: 180
+          days-before-close: 30
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          remove-stale-when-updated: true
+          stale-issue-label: "stale"
+          stale-issue-message: >
+            There hasn't been any activity on this issue in the past 6 months, so it has
+            been marked as stale and it will be closed automatically if no further
+            activity occurs in the next 30 days.
+
+            If you want this issue to never become stale, please ask a PSC member to
+            apply the "no stale" label.
+
+      # 15+30 day stale policy for issues pending more information
+      # * Issues that are pending more information
+      # * Except Issues marked as "no stale"
+      - name: Needs more information stale issues policy
+        uses: actions/stale@v4
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          only-labels: "needs more information"
+          exempt-issue-labels: "no stale"
+          days-before-stale: 15
+          days-before-close: 30
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          remove-stale-when-updated: true
+          stale-issue-label: "stale"
+          stale-issue-message: >
+            This issue needs more information and there hasn't been any activity
+            recently, so it has been marked as stale and it will be closed automatically
+            if no further activity occurs in the next 30 days.
+
+            If you think this is a mistake, please ask a PSC member to remove the "needs
+            more information" label.

src/.github/workflows/stale.yml

@@ -0,0 +1 @@
+../../../.github/workflows/stale.yml