Download and Install JBang

https://www.jbang.dev/download/

Run local

$ jbang ./scripts/membercount.java
Team Lichess Swiss has 212788 members!

Run public (downloads and runs locally, from a public source)

$ jbang membercount@tors42/jbang-chariot
Team Lichess Swiss has 212788 members!

That looks scary, yeah? Docker to the rescue!

$ docker run --rm --interactive --tty --entrypoint /bin/bash jbangdev/jbang-action
Unable to find image 'jbangdev/jbang-action:latest' locally
latest: Pulling from jbangdev/jbang-action
f3ef4ff62e0d: Pull complete
706b9b9c1c44: Pull complete
562d89eb239f: Pull complete
c7788248e4a0: Pull complete
6ef097673c9f: Pull complete
e19d3c1de3ca: Pull complete
Digest: sha256:842a4a39a3c48f5e8c1e2368a7fe1bb6d4bfca7aa0f4d0d2f3ab31b1dbbc89e7
Status: Downloaded newer image for jbangdev/jbang-action:latest
root@b4bb09cfb08b:/#

root@b4bb09cfb08b:/# jbang trust add https://github.com/tors42/
[jbang] Adding [https://github.com/tors42/] to /jbang/.jbang/trusted-sources.json
root@b4bb09cfb08b:/#

root@b4bb09cfb08b:/# jbang membercount@tors42/jbang-chariot lichess-swiss
[jbang] Downloading JDK 17. Be patient, this can take several minutes...
[jbang] Installing JDK 17...
[jbang] Default JDK set to 17
[jbang] Resolving dependencies...
[jbang] io.github.tors42:chariot:jar:0.0.32
Done
[jbang] Dependencies resolved
[jbang] Building jar...
Lichess Swiss has 212816 members!

root@b4bb09cfb08b:/#

And again, now when everything has been downloaded already,

root@b4bb09cfb08b:/# jbang membercount@tors42/jbang-chariot lichess-swiss
Lichess Swiss has 212816 members!

root@b4bb09cfb08b:/#