container: wrap container init start errors

This helps indicate the exact origin and nature of the error. This eliminates generic WrapErr from container.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/app/app.go

@@ -62,7 +62,7 @@ func (a *App) String() string {
 	return fmt.Sprintf("(unsealed app %s)", a.id)
 }
 
-// Seal determines the outcome of [hst.Config] as a [SealedApp].
+// Seal determines the [Outcome] of [hst.Config].
 // Values stored in and referred to by [hst.Config] might be overwritten and must not be used again.
 func (a *App) Seal(config *hst.Config) (*Outcome, error) {
 	a.mu.Lock()

internal/app/shim.go

@@ -65,7 +65,7 @@ func ShimMain() {
 		if errors.Is(err, syscall.EBADF) {
 			log.Fatal("invalid config descriptor")
 		}
-		if errors.Is(err, container.ErrNotSet) {
+		if errors.Is(err, container.ErrReceiveEnv) {
 			log.Fatal("HAKUREI_SHIM not set")
 		}