cue modules: move stdlib to pkg/alpha.dagger.io

In preparation for Europa, we will vendor multiple CUE modules:

- `pkg/alpha.dagger.io`: legacy non-europa packages
- `pkg/dagger.io`: core Europa packages
- `pkg/universe.dagger.io`: Europa universe

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

plancontext/fs.go

@@ -9,14 +9,14 @@ import (
 	"github.com/moby/buildkit/client/llb"
 	bkgw "github.com/moby/buildkit/frontend/gateway/client"
 	"go.dagger.io/dagger/compiler"
-	"go.dagger.io/dagger/stdlib"
+	"go.dagger.io/dagger/pkg"
 )
 
 var (
 	fsIDPath = cue.MakePath(
 		cue.Str("$dagger"),
 		cue.Str("fs"),
-		cue.Hid("_id", stdlib.EnginePackage),
+		cue.Hid("_id", pkg.EnginePackage),
 	)
 )
 

plancontext/secret.go

@@ -6,14 +6,14 @@ import (
 
 	"cuelang.org/go/cue"
 	"go.dagger.io/dagger/compiler"
-	"go.dagger.io/dagger/stdlib"
+	"go.dagger.io/dagger/pkg"
 )
 
 var (
 	secretIDPath = cue.MakePath(
 		cue.Str("$dagger"),
 		cue.Str("secret"),
-		cue.Hid("_id", stdlib.EnginePackage),
+		cue.Hid("_id", pkg.EnginePackage),
 	)
 )
 

plancontext/service.go

@@ -6,14 +6,14 @@ import (
 
 	"cuelang.org/go/cue"
 	"go.dagger.io/dagger/compiler"
-	"go.dagger.io/dagger/stdlib"
+	"go.dagger.io/dagger/pkg"
 )
 
 var (
 	serviceIDPath = cue.MakePath(
 		cue.Str("$dagger"),
 		cue.Str("service"),
-		cue.Hid("_id", stdlib.EnginePackage),
+		cue.Hid("_id", pkg.EnginePackage),
 	)
 )