roles/bitwarden_rs: Install sqlite

The `sqlite3` command is required to take consistent backups of the
Bitwarden_rs database.

roles/bitwarden_rs/tasks/main.yml

@@ -1,3 +1,10 @@
+- name: ensure sqlite command is installed
+  package:
+    name: sqlite
+    state: present
+  tags:
+  - install
+
 - name: ensure python docker client is installed
   package:
     name: python3-docker