add: zig and build.sh

build systems

toolchain/lib/recipe.lua

@@ -11,7 +11,7 @@
 --     url          = "https://.../mypkg-1.2.3.tar.gz",
 --     sha256       = nil,            -- optional source checksum
 --     deps         = { "libfoo" },
---     build_system = "meson",       -- autotools | cmake | meson | make | cargo | custom
+--     build_system = "meson",       -- autotools | cmake | meson | make | cargo | zig | build.sh | custom
 --     configure_args = { ... },     -- optional extra args
 --     build_script  = "build.sh",   -- required for custom
 --     test         = "test -f ${DESTDIR}/usr/bin/mypkg",
@@ -31,7 +31,8 @@ local KNOWN_KEYS = {
 
 local BUILD_SYSTEMS = {
   autotools = true, cmake = true, meson = true,
-  make = true, cargo = true, custom = true,
+  make = true, cargo = true, zig = true,
+  ["build.sh"] = true, custom = true,
 }
 
 local HEX64 = "^" .. string.rep("%x", 64) .. "$"