I asked chatgpt to write a go program for this, this looks roughly correct (I have used both libraries before) obviously this won't be enough for your particular use case. I imagine you can integrate an RSS feed to your site, however if you're using something like hugo perhaps output it as a csv.

Super low effort but a good start I think:

package main

import (
	"fmt"
	"log"
	"os"
	"strings"
	"time"

	git "github.com/go-git/go-git/v5"
	rss "github.com/jteeuwen/go-pkg-rss"
)

const (
	timeout = 5 // timeout in seconds for the RSS feed generation
)

// Repository represents a git repository with its URL
type Repository struct {
	URL string
}

// Repositories is the list of git repositories
var Repositories = []Repository{
	{URL: "https://github.com/owner/repo1"},
	{URL: "https://github.com/owner/repo2"},
	// Add more repositories here
}

// FetchLatestTag fetches the latest tag from a git repository
func FetchLatestTag(repoURL string) (string, string, error) {
	// Clone the repository to a temporary directory
	dir, err := os.MkdirTemp("", "repo")
	if err != nil {
		return "", "", err
	}
	defer os.RemoveAll(dir)

	_, err = git.PlainClone(dir, true, &git.CloneOptions{
		URL:      repoURL,
		Progress: os.Stdout,
	})
	if err != nil {
		return "", "", err
	}

	repo, err := git.PlainOpen(dir)
	if err != nil {
		return "", "", err
	}

	tags, err := repo.Tags()
	if err != nil {
		return "", "", err
	}

	var latestTag string
	var latestCommitTime time.Time

	err = tags.ForEach(func(ref *plumbing.Reference) error {
		tag := ref.Name().Short()
		commit, err := repo.CommitObject(ref.Hash())
		if err != nil {
			return err
		}
		if commit.Committer.When.After(latestCommitTime) {
			latestCommitTime = commit.Committer.When
			latestTag = tag
		}
		return nil
	})
	if err != nil {
		return "", "", err
	}

	return latestTag, latestCommitTime.Format(time.RFC1123Z), nil
}

// GenerateRSS generates an RSS feed from the latest tags of the repositories
func GenerateRSS() string {
	feed := rss.Feed{
		Title:       "Latest Tags from Git Repositories",
		Link:        &rss.Link{Href: "http://example.com/"},
		Description: "This feed provides the latest tags from a list of git repositories.",
		Created:     time.Now(),
	}

	for _, repo := range Repositories {
		tag, date, err := FetchLatestTag(repo.URL)
		if err != nil {
			log.Printf("Error fetching latest tag for repository %s: %v", repo.URL, err)
			continue
		}
		feed.Items = append(feed.Items, &rss.Item{
			Title:       fmt.Sprintf("Latest tag for %s: %s", repo.URL, tag),
			Link:        &rss.Link{Href: repo.URL},
			Description: fmt.Sprintf("The latest tag for repository %s is %s, created on %s.", repo.URL, tag, date),
			Created:     time.Now(),
		})
	}

	var rssFeed strings.Builder
	rssFeed.WriteString(xml.Header)
	if err := feed.Write(&rssFeed); err != nil {
		log.Fatalf("Error generating RSS feed: %v", err)
	}

	return rssFeed.String()
}

func main() {
	rssFeed := GenerateRSS()
	fmt.Println(rssFeed)
}