pkg/aflow/action/kernel/build: fix a typo

While we are at it, let's also make it a constant to make the intent
clearer.

Author: FlorentRevest

pkg/aflow/action/kernel/build.go

@@ -44,8 +44,8 @@ func buildKernel(ctx *aflow.Context, args buildArgs) (buildResult, error) {
 		image := filepath.FromSlash(build.LinuxKernelImage(targets.AMD64))
 		makeArgs := build.LinuxMakeArgs(target, targets.DefaultLLVMCompiler, targets.DefaultLLVMLinker,
 			"ccache", dir, runtime.NumCPU())
-		compileCommnads := "compile_commands.json"
-		makeArgs = append(makeArgs, "-s", path.Base(image), compileCommnads)
+		const compileCommands = "compile_commands.json"
+		makeArgs = append(makeArgs, "-s", path.Base(image), compileCommands)
 		if out, err := osutil.RunCmd(time.Hour, args.KernelSrc, "make", makeArgs...); err != nil {
 			return aflow.FlowError(fmt.Errorf("make failed: %w\n%s", err, out))
 		}
@@ -55,7 +55,7 @@ func buildKernel(ctx *aflow.Context, args buildArgs) (buildResult, error) {
 		keepFiles := map[string]bool{
 			filepath.Join(dir, image):               true,
 			filepath.Join(dir, target.KernelObject): true,
-			filepath.Join(dir, compileCommnads):     true,
+			filepath.Join(dir, compileCommands):     true,
 		}
 		return filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
 			if err != nil || d.IsDir() || keepFiles[path] || keepExt[filepath.Ext(d.Name())] {