Ensure all GitHub releases are fetched when searching provider versions

cmd/clusterctl/client/repository/repository_github.go

@@ -280,11 +280,12 @@ func (g *gitHubRepository) getVersions() ([]string, error) {
 
 	// get all the releases
 	// NB. currently Github API does not support result ordering, so it not possible to limit results
-	var releases []*github.RepositoryRelease
+	var allReleases []*github.RepositoryRelease
 	var retryError error
 	_ = wait.PollImmediate(retryableOperationInterval, retryableOperationTimeout, func() (bool, error) {
 		var listReleasesErr error
-		releases, _, listReleasesErr = client.Repositories.ListReleases(context.TODO(), g.owner, g.repository, nil)
+		// Get the first page of GitHub releases
+		releases, response, listReleasesErr := client.Repositories.ListReleases(context.TODO(), g.owner, g.repository, nil)
 		if listReleasesErr != nil {
 			retryError = g.handleGithubErr(listReleasesErr, "failed to get the list of releases")
 			// return immediately if we are rate limited
@@ -293,14 +294,33 @@ func (g *gitHubRepository) getVersions() ([]string, error) {
 			}
 			return false, nil
 		}
+		allReleases = append(allReleases, releases...)
+
+		// https://github.com/google/go-github/blob/master/github/github.go#L536-L546
+		if response.NextPage != 0 && response.LastPage != 0 {
+			nextPage := response.NextPage
+			lastPage := response.LastPage
+			for pageNum := nextPage; pageNum <= lastPage; pageNum++ {
+				releases, _, listReleasesErr = client.Repositories.ListReleases(context.TODO(), g.owner, g.repository, &github.ListOptions{Page: pageNum})
+				if listReleasesErr != nil {
+					retryError = g.handleGithubErr(listReleasesErr, "failed to get the list of releases")
+					// return immediately if we are rate limited
+					if _, ok := listReleasesErr.(*github.RateLimitError); ok {
+						return false, retryError
+					}
+					return false, nil
+				}
+				allReleases = append(allReleases, releases...)
+			}
+		}
 		retryError = nil
 		return true, nil
 	})
 	if retryError != nil {
 		return nil, retryError
 	}
 	versions := []string{}
-	for _, r := range releases {
+	for _, r := range allReleases {
 		r := r // pin
 		if r.TagName == nil {
 			continue