Preserve existing Aegis filesystem tables

Co-authored-by: fscotto <17803710+fscotto@users.noreply.github.com>

ansible/bootstrap/aegis.bu

@@ -27,12 +27,14 @@ storage:
     - path: /etc/crypttab
       mode: 0644
       contents:
-        inline: |
+        append:
+          - inline: |
               aegis-data /dev/disk/by-partlabel/aegis-data - tpm2-device=auto
     - path: /etc/fstab
       mode: 0644
       contents:
-        inline: |
+        append:
+          - inline: |
               /dev/mapper/aegis-data /var/lib btrfs defaults,compress=zstd 0 0
     - path: /usr/local/sbin/aegis-storage-init
       mode: 0750