First stab at maintain-one-comment action

action.yml

@@ -13,6 +13,15 @@ inputs:
   build-metadata-file-path:
     description: 'Path to the build-metadata.json file'
     required: false
+  body:
+    description: 'Body of the comment'
+    required: false
+  body-marker:
+    description: 'Comment marker'
+    required: false
+  pr-number:
+    description: 'The number of the pull request'
+    required: false
 runs:
   using: "composite"
   steps:

src/main/java/io/quarkus/bot/maintainonecomment/MaintainOneCommentAction.java

@@ -0,0 +1,38 @@
+package io.quarkus.bot.maintainonecomment;
+
+import java.io.IOException;
+import java.util.Optional;
+
+import org.kohsuke.github.GHIssueComment;
+import org.kohsuke.github.GHPullRequest;
+import org.kohsuke.github.GHRepository;
+import org.kohsuke.github.GitHub;
+
+import io.quarkiverse.githubaction.Action;
+import io.quarkiverse.githubaction.Context;
+import io.quarkiverse.githubaction.Inputs;
+
+public class MaintainOneCommentAction {
+
+    @Action("maintain-one-comment")
+    void maintainOneComment(Context context, Inputs inputs, GitHub gitHub) throws IOException {
+        String body = inputs.getRequired("body");
+        String bodyMarker = inputs.getRequired("body-marker");
+        int prNumber = inputs.getRequiredInt("pr-number");
+
+        GHRepository repository = gitHub.getRepository(context.getGitHubRepository());
+        GHPullRequest pullRequest = repository.getPullRequest(prNumber);
+
+        Optional<GHIssueComment> maintainedComment = pullRequest.listComments().toList().stream()
+                .filter(c -> c.getBody() != null && c.getBody().contains(bodyMarker))
+                .findFirst();
+
+        String markedBody = body + "\n\n" + bodyMarker;
+
+        if (maintainedComment.isEmpty()) {
+            pullRequest.comment(markedBody);
+        } else {
+            maintainedComment.get().update(markedBody);
+        }
+    }
+}