Use default gRPC dialer when connecting to satellites (#4115)

Uses a new feature in buildkit which forces use of the default grpc
dialer in the client-side connection. The default dialer supports HTTP
connect proxies, which allows earthly to connect with BYOC satellites
that may be behind a VPN like Tailscale.

buildkitd/Earthfile

@@ -12,7 +12,7 @@ buildkitd:
             ARG BUILDKIT_BASE_IMAGE=$BUILDKIT_PROJECT+build
         END
     ELSE
-        ARG BUILDKIT_BASE_IMAGE=github.com/earthly/buildkit:594835b598b9140741472bd8f3524cb502aa49f8+build
+        ARG BUILDKIT_BASE_IMAGE=github.com/earthly/buildkit:531b303aa8ec03c29c2ceaa140eb0a6d32e6f6f3+build
     END
     ARG EARTHLY_TARGET_TAG_DOCKER
     ARG TAG="dev-$EARTHLY_TARGET_TAG_DOCKER"

buildkitd/buildkitd.go

@@ -1012,10 +1012,12 @@ func addRequiredOpts(settings Settings, installationName string, isUsingPodman b
 	}
 
 	if settings.SatelliteName != "" {
-		opts = append(opts, client.WithAdditionalMetadataContext(
-			"satellite_name", settings.SatelliteName,
-			"satellite_org", settings.SatelliteOrgID,
-			"satellite_token", settings.SatelliteToken),
+		opts = append(opts,
+			client.WithDefaultGRPCDialer(),
+			client.WithAdditionalMetadataContext(
+				"satellite_name", settings.SatelliteName,
+				"satellite_org", settings.SatelliteOrgID,
+				"satellite_token", settings.SatelliteToken),
 		)
 	}
 

go.mod

@@ -150,6 +150,6 @@ replace (
 	github.com/jdxcode/netrc => github.com/mikejholly/netrc v0.0.0-20221121193719-a154cb29ec2a
 	github.com/jessevdk/go-flags => github.com/alexcb/go-flags v0.0.0-20210722203016-f11d7ecb5ee5
 
-	github.com/moby/buildkit => github.com/earthly/buildkit v0.0.0-20240419223558-594835b598b9
+	github.com/moby/buildkit => github.com/earthly/buildkit v0.0.0-20240515200521-531b303aa8ec
 	github.com/tonistiigi/fsutil => github.com/earthly/fsutil v0.0.0-20231030221755-644b08355b65
 )

go.sum

@@ -190,8 +190,8 @@ github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4
 github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
-github.com/earthly/buildkit v0.0.0-20240419223558-594835b598b9 h1:yN1+9T45k+wyzD2Jaf0xSc7bvE0nx09WH2oLb49+vk4=
-github.com/earthly/buildkit v0.0.0-20240419223558-594835b598b9/go.mod h1:1/yAC8A0Tu94Bdmv07gaG1pFBp+CetVwO7oB3qvZXUc=
+github.com/earthly/buildkit v0.0.0-20240515200521-531b303aa8ec h1:vf6x0fPOWKakjH3n2N1O9Tg5j1HDIJsC3Kkgmuko2U0=
+github.com/earthly/buildkit v0.0.0-20240515200521-531b303aa8ec/go.mod h1:1/yAC8A0Tu94Bdmv07gaG1pFBp+CetVwO7oB3qvZXUc=
 github.com/earthly/cloud-api v1.0.1-0.20240508215807-a958f373126f h1:8CXT0MQ7dQrtm/IwVIexffosImh4ht0WUiWQAt0UoeQ=
 github.com/earthly/cloud-api v1.0.1-0.20240508215807-a958f373126f/go.mod h1:rU/tYJ7GFBjdKAITV2heDbez++glpGSbtJaZcp73rNI=
 github.com/earthly/fsutil v0.0.0-20231030221755-644b08355b65 h1:6oyWHoxHXwcTt4EqmMw6361scIV87uEAB1N42+VpIwk=