allow no trailing slash latest snapshot link

[LesnyRumcajs]

Summary of changes
Changes introduced in this pull request:

• allow links without trailing slashes. Both wget https://forest-archive.chainsafe.dev/latest/calibnet and wget https://forest-archive.chainsafe.dev/latest/calibnet/ should work now.

Reference issue to close (if applicable)

Closes #286

Other information and links

[lemmih]

Are you sure this will support both paths?

[LesnyRumcajs]

Are you sure this will support both paths?

Interestingly, wrangler had a peculiar behaviour with only:

    { pattern = "forest-archive.chainsafe.dev/latest/calibnet", zone_name = "chainsafe.dev" },

For /calibnet/ it dismissed the preview bucket and downloaded directly from the prod bucket.

❯ wget http://127.0.0.1:46647/latest/calibnet/
--2023-11-02 10:26:43--  http://127.0.0.1:46647/latest/calibnet/
Connecting to 127.0.0.1:46647... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2666784294 (2.5G) [application/zstd]

while the /calibnet downloaded from the preview bucket correctly.

❯ wget http://127.0.0.1:46647/latest/calibnet
--2023-11-02 10:35:27--  http://127.0.0.1:46647/latest/calibnet
Connecting to 127.0.0.1:46647... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2065053670 (1.9G) [application/zstd]

Now, both are downloading from the same bucket. Thanks for doubting it; I only checked that it downloads "some archives" before.