ci: fix regression from not building docs
ci: fix regression from not building docs

0e4f7a8e3f94f0e799280d7e7836d67d776cbca6 forgot to build the docs,
causing CI failures

zig-lang/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,andrewrk/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig