feat: add CLI command for importing and exporting Pocket ID data (#998)

Co-authored-by: Alessandro (Ale) Segala <43508+ItalyPaleAle@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

tests/setup/docker-compose-postgres.yml

@@ -11,7 +11,7 @@ services:
       - POSTGRES_PASSWORD=postgres
       - POSTGRES_DB=pocket-id
     healthcheck:
-      test: ['CMD-SHELL', 'pg_isready -U postgres']
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
       interval: 5s
       timeout: 5s
       retries: 5
@@ -27,3 +27,6 @@ services:
     depends_on:
       postgres:
         condition: service_healthy
+
+volumes:
+  pocket-id-test-data: