Run unit tests under the building architecture

This also removed the need for `@intCase()`
Also move the making directories and copying to a script to the build is simpler.

Install qemu earler
Added chmod +x
Fixed copy elf


Added missing switch for qemu binary


Spelling


Make makeiso.sh executable

No longer chmod makeiso.sh

Use the cache root to set the output directory

src/kernel/kmain.zig

@@ -15,9 +15,11 @@ const panic_root = if (is_test) @import(mock_path ++ "panic_mock.zig") else @imp
 const options = @import("build_options");
 
 comptime {
-    switch (builtin.arch) {
-        .i386 => _ = @import("arch/x86/boot.zig"),
-        else => {},
+    if (!is_test) {
+        switch (builtin.arch) {
+            .i386 => _ = @import("arch/x86/boot.zig"),
+            else => {},
+        }
     }
 }