after a release, post to issues once (#2691)

.github/workflows/release.yml

@@ -81,19 +81,25 @@ jobs:
             basehead: `${prevTag.commit.sha}...${curTag.commit.sha}`,
           });
 
+          const issues = {};
+
           for (const commit of diff.data.commits) {
             for (const match of commit.commit.message.matchAll(/(^| |\()#([0-9]+)( |\)|$)/g)) {
+              issues[match[2]] = 1;
+            }
+          }
+
+          for (const issue in issues) {
             try {
               await github.rest.issues.createComment({
                 owner,
                 repo,
-                  issue_number: parseInt(match[2]),
+                issue_number: parseInt(issue),
                 body: `This issue is mentioned in release ${curTag.name} 🚀\n`
                   + `Check out the entire changelog by [clicking here](https://github.com/${owner}/${repo}/releases/tag/${curTag.name})`,
               });
             } catch (exc) {}
           }
-          }
 
   dockerhub:
     needs: binaries