Make /data disk work on any vagrant provider

.gitignore

@@ -1 +1,2 @@
-id_rsa
+id_rsa
+.vagrant/

Vagrantfile

@@ -4,20 +4,20 @@
 Vagrant.configure("2") do |config|
   # Provision /data. In production, the size is hard-coded in web.
   # https://github.com/superfly/web/blob/663d025e29d52567ffb6cbe1b2d8640ac7099e46/app/graphql/mutations/ensure_machine_remote_builder.rb#L87
-  config.vm.provider :libvirt do |libvirt|
-    libvirt.storage :file, :size => '50GB'
-    config.vm.provision 'mount_data', type:"shell", inline: <<-SHELL
-      set -euo pipefail
+  config.vm.disk :disk, name: "data", size: '50GB'
+  config.vm.provision 'mount_data', type:"shell", inline: <<-SHELL
+    set -euo pipefail
 
-      parted /dev/vdb --script mklabel gpt
-      parted /dev/vdb --script mkpart primary ext4 0% 100%
+    lsblk
 
-      mkfs.ext4 /dev/vdb1
+    parted /dev/sdb --script mklabel gpt
+    parted /dev/sdb --script mkpart primary ext4 0% 100%
 
-      mkdir /data
-      mount /dev/vdb1 /data
-    SHELL
-  end
+    mkfs.ext4 /dev/sdb1
+
+    mkdir /data
+    mount /dev/sdb1 /data
+  SHELL
 
   # Host-only network configuration
   config.vm.network "private_network", ip: "192.168.50.10"