chore: add a workflow to reopen the inactive issues

Author: lmxyy

.github/workflows/close-inactive-issues.yaml

@@ -69,7 +69,7 @@ jobs:
                           owner,
                           repo,
                           issue_number: issue.number,
-                          body: 'This issue has been automatically closed due to 30-day inactivity. Please feel free to reopen it with `/reopen` if needed.'
+                          body: 'This issue has been automatically closed due to 30-day inactivity. Please feel free to reopen it with \`/reopen\` if needed.'
                         });
                         console.log(`Closed issue #${issue.number} due to inactivity.`);
                       } catch (error) {

.github/workflows/reopen-issues.yaml

@@ -50,7 +50,7 @@ jobs:
                         owner,
                         repo,
                         issue_number: issueNumber,
-                        body: `Issue reopened by @${commentAuthor} via /reopen command.`,
+                        body: `Issue reopened by @${commentAuthor} via \`/reopen\` command.`,
                       });
 
                       console.log(`Reopened issue #${issueNumber} with 'inactive' label by issuer.`);