Add install step to tests in build script

.vscode/launch.json

@@ -23,7 +23,7 @@
 			"name": "Test",
 			"type": "gdb",
 			"request": "launch",
-			"target": "${workspaceFolder}/zig-cache/o/2c2b6e0f85a1dcd7caa00765b05ec679/test",
+			"target": "${workspaceFolder}/zig-cache/o/acfc38b60cc59a70f8386ac73748d92a/test",
 			"arguments": "main.zig",
 			"cwd": "${workspaceRoot}",
 			"valuesFormatting": "parseText",

build.zig

@@ -39,6 +39,7 @@ pub fn build(builder: *std.build.Builder) void {
         tests.addPackage(core_pkg);
         tests.setTarget(target);
         tests.setBuildMode(mode);
+        tests.install();
         builder.step("test", "Run unit tests").dependOn(&tests.step);
     }
 }