env/linux-x86-fedora: add Fedora builder

Not using a Fedora kernel yet, but better than nothing.

Updates golang/go#26796

Change-Id: I228442bf6606696407a8d3fbd098df59df7353e1
Reviewed-on: https://go-review.googlesource.com/c/build/+/175999
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index 9a2ec38..838da93 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -113,6 +113,12 @@
 		buildletURLTmpl: "http://storage.googleapis.com/$BUCKET/buildlet.linux-amd64",
 		env:             []string{"GOROOT_BOOTSTRAP=/go1.4"},
 	},
+	"host-linux-fedora": &HostConfig{
+		Notes:           "Fedora 30",
+		ContainerImage:  "linux-x86-fedora:latest",
+		buildletURLTmpl: "http://storage.googleapis.com/$BUCKET/buildlet.linux-amd64",
+		env:             []string{"GOROOT_BOOTSTRAP=/goboot"},
+	},
 	"host-linux-arm-scaleway": &HostConfig{
 		IsReverse:       true,
 		HermeticReverse: true,
@@ -1534,6 +1540,12 @@
 		Notes:     "Debian sid (unstable)",
 	})
 	addBuilder(BuildConfig{
+		Name:      "linux-amd64-fedora",
+		HostType:  "host-linux-fedora",
+		MaxAtOnce: 1,
+		Notes:     "Fedora",
+	})
+	addBuilder(BuildConfig{
 		Name:     "linux-amd64-androidemu",
 		HostType: "host-android-amd64-emu",
 		env: []string{