Add autocomment for needs-info label

When a reviewer of an issue determines that an issue is incompleted, a
`needs-info` label can be added to the issue.  This will trigger a GH
action with an automated response.  The reviewer should also have told
the user what is needed or asked a question.  Also, we have no automated
way to remove the label when a response is provided, so this still needs
to be managed.

Signed-off-by: Brent Baude <bbaude@redhat.com>

.github/workflows/needs-info-labeler.yaml

@@ -0,0 +1,28 @@
+name: Needs info labeler
+on:
+  issues:
+    types:
+      - labeled
+jobs:
+  add-comment:
+    if: github.event.label.name == 'needs-info'
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - name: Add comment
+        run: gh issue comment "$NUMBER" --body "$BODY"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          NUMBER: ${{ github.event.issue.number }}
+          BODY: |
+            A reviewer has determined we need more information to understand the reported issue.  A comment on what is missing should be provided. Be certain you:
+
+            * provide an exact reproducer where possible
+            * verify you have provided all relevant information - minimum is `podman info`
+            * answer any follow up questions
+
+            If no response to the `needs-info` is provided in 30 days, this issue may be closed by our stale bot.
+
+            For more information on reporting issues on this repository, consult our [issue guide](ISSUE.md).