stale: refine messages for issues and pull requests (spack#51156)

* stale: refine messages for issues and pull requests

Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

* Improve message for issues PRs without comments yet

Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

* Fold newlines into spaces, except where a blank line is found

Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

* stale: update messages to mention @spack/spack-releasers and Slack channel

Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

* stale: don't ping releasers in stalebot messages

Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

* stale: clarify messages for closed issues and pull requests

Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

---------

Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

Author: alalazo

.github/workflows/stale.yaml

@@ -16,23 +16,37 @@ jobs:
       - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639
         with:
           # Issues configuration
-          stale-issue-message: |
-            This issue has been automatically marked as stale because it has not had 
-            any activity in the last 6 months. It will be closed if there is no further activity.
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has not had any activity in the last 6 months.
+            It will be closed in 30 days if there is no further activity.
+            
+            If the issue is waiting for a reply from maintainers, feel free to ping them as a reminder.
+            If it is waiting and has no comments yet, feel free to ping `@spack/spack-releasers` or simply leave a comment saying this should not be marked stale.
+            This will also reset the issue's stale state.
+            
             Thank you for your contributions!
-          close-issue-message: |
+          close-issue-message: >
             This issue was closed because it had no activity for 30 days after being marked stale.
+            If you feel this is in error, please feel free to reopen this issue.
           stale-issue-label: 'stale'
           any-of-issue-labels: 'build-error'
           exempt-issue-labels: 'pinned,bug'
 
           # Pull requests configuration
-          stale-pr-message: |
-            This pull request has been automatically marked as stale because it has not had 
-            any activity in the last 6 months. It will be closed if there is no further activity.
+          stale-pr-message: >
+            This pull request has been automatically marked as stale because it has not had any activity in the last 6 months. 
+            It will be closed in 30 days if there is no further activity.
+            
+            If the pull request is waiting for a reply from reviewers, feel free to ping them as a reminder.
+            If it is waiting and has no assigned reviewer, feel free to ping `@spack/spack-releasers` or simply leave a comment saying this should not be marked stale.
+            This will reset the pull request's stale state.
+            
+            To get more eyes on your pull request, you can post a link in the #pull-requests channel of the Spack Slack.
+            
             Thank you for your contributions!
-          close-pr-message: |
+          close-pr-message: >
             This pull request was closed because it had no activity for 30 days after being marked stale.
+            If you feel this is in error, please feel free to reopen this pull request.
           stale-pr-label: 'stale'
           any-of-pr-labels: 'new-package,update-package'
           exempt-pr-labels: 'pinned'