don't store dev bundle release keys in the datastore

This is a nicety for development, so that we always load a development bundle to avoid having
to give them distinct names etc. Just call you release "dev" or "dev.xxx..." and put the bundle
in `.lotus/builtin-actors/v8/dev/builting-actors-${network}.{car,sha256sum}` and it will be
unconditionally loaded.

node/modules/builtin_actors.go

@@ -2,6 +2,7 @@ package modules
 
 import (
 	"fmt"
+	"strings"
 	"sync"
 
 	"go.uber.org/fx"
@@ -71,6 +72,11 @@ func LoadBuiltinActors(lc fx.Lifecycle, mctx helpers.MetricsCtx, r repo.LockedRe
 			return result, err
 		}
 
+		if rel == "dev" || strings.HasPrefix(rel, "dev.") {
+			// don't store the release key so that we always load development bundles
+			continue
+		}
+
 		// add the release key with the manifest to avoid reloading it in next restart.
 		if err := ds.Put(ctx, key, mfCid.Bytes()); err != nil {
 			return result, xerrors.Errorf("error storing manifest CID for builtin-actors vrsion %d to the datastore: %w", av, err)