feat: Set up filesystems

Automatically set up btrfs root and data filesystem, as well as external
HDD.

This automation change assumes a layout exactly as in current bob to
function by default, can be changed to any btrfs layout with the
`btrfs_mounts` configuration option, however.

roles/filesystem/defaults/main.yaml

@@ -0,0 +1,30 @@
+---
+should_mount_external_hdd: true
+should_reboot_machine: false
+
+btrfs_mounts:
+  - path: "/"
+    subvol: "@rootfs"
+    uuid: "3204f33f-5fa7-4c11-bdd8-979c539fce91"
+    opts: "defaults,ssd,noatime,compress=zstd:3,space_cache=v2"
+  - path: "/home"
+    subvol: "@home"
+    uuid: "3204f33f-5fa7-4c11-bdd8-979c539fce91"
+    opts: "defaults,ssd,noatime,compress=zstd:3,space_cache=v2"
+
+  - path: "/srv/media"
+    subvol: "@media"
+    uuid: "2256bd23-7751-486a-bfc4-b216a6b0c4f4"
+    opts: "defaults,noatime,compress=zstd:3,space_cache=v2"
+  - path: "/srv/files"
+    subvol: "@files"
+    uuid: "2256bd23-7751-486a-bfc4-b216a6b0c4f4"
+    opts: "defaults,noatime,compress=zstd:3,space_cache=v2"
+  - path: "/srv/documents"
+    subvol: "@documents"
+    uuid: "2256bd23-7751-486a-bfc4-b216a6b0c4f4"
+    opts: "defaults,noatime,compress=zstd:3,space_cache=v2"
+  - path: "/srv/wolf"
+    subvol: "@wolf"
+    uuid: "2256bd23-7751-486a-bfc4-b216a6b0c4f4"
+    opts: "defaults,noatime,compress=zstd:1,space_cache=v2"