rhysd

Yes. It is compiled to Vim script using ELVM[1]. Though the author of Vim script backend of ELVM is me :)

[1]: https://github.com/shinh/elvm

No. It is a C compiler compiled to Vim script. So it is actually a C compiler written in Vim script.

The first pitfall can be statically detected with actionlint

https://github.com/rhysd/actionlint

> oops.yaml:20:24: property "jobone" is not defined in object type {jobtwo: {outputs: {}; result: string}} [expression]

Seems that Google has no budget to pay their GCP instances