cmd/containerbuild: use TrimSuffix instead of TrimRight (#157)

Using TrimRight will remove all characters from `*dockerRepo` from right
to left that match a character contained on `"/"+filepath.Base(*dockerRepo)`
(the cutset) until it doesn't matches anymore.

So for example, if `dockerRepo` is `example.com/fijxu/anubis`, and
`"/"+filepath.Base(*dockerRepo)` is `/anubis`, it will remove
`u/anubis` and not just `/anubis` from `dockerRepo` because `u` is a character inside the
cutoff.

cmd/containerbuild/main.go

@@ -30,7 +30,7 @@ func main() {
 
 	internal.InitSlog(*slogLevel)
 
-	koDockerRepo := strings.TrimRight(*dockerRepo, "/"+filepath.Base(*dockerRepo))
+	koDockerRepo := strings.TrimSuffix(*dockerRepo, "/"+filepath.Base(*dockerRepo))
 
 	if *githubEventName == "pull_request" && *pullRequestID != -1 {
 		*dockerRepo = fmt.Sprintf("ttl.sh/techaro/pr-%d/anubis", *pullRequestID)

docs/docs/CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Developer documentation has been added to the docs site
 - Show more errors when some predictable challenge page errors happen ([#150](https://github.com/TecharoHQ/anubis/issues/150))
 - Verification page now shows hash rate and a progress bar for completion probability.
+- Use `TrimSuffix` instead of `TrimRight` on containerbuild
 
 ## v1.15.0