get all open PRs for a preview environment enabled repository

api/server/handlers/environment/list_deployments_by_cluster.go

@@ -178,7 +178,7 @@ func fetchOpenPullRequests(
 	openPRs, resp, err := client.PullRequests.List(ctx, env.GitRepoOwner, env.GitRepoName,
 		&github.PullRequestListOptions{
 			ListOptions: github.ListOptions{
-				PerPage: 50,
+				PerPage: 100,
 			},
 		},
 	)
@@ -193,6 +193,21 @@ func fetchOpenPullRequests(
 		return nil, err
 	}
 
+	var ghPRs []*github.PullRequest
+
+	for resp.NextPage != 0 && err != nil {
+		ghPRs, resp, err = client.PullRequests.List(ctx, env.GitRepoOwner, env.GitRepoName,
+			&github.PullRequestListOptions{
+				ListOptions: github.ListOptions{
+					PerPage: 100,
+					Page:    resp.NextPage,
+				},
+			},
+		)
+
+		openPRs = append(openPRs, ghPRs...)
+	}
+
 	for _, pr := range openPRs {
 		if _, ok := deplInfoMap[fmt.Sprintf("%s-%s-%d", env.GitRepoOwner, env.GitRepoName, pr.GetNumber())]; !ok {
 			prs = append(prs, &types.PullRequest{