Add prune command

abra.sh

@@ -1,2 +1,24 @@
 export NGINX_CONFIG_VERSION=v1
 export APP_ENTRYPOINT_VERSION=v1
+
+sub_npm() {
+  export NODE_CONFIG_DIR=/app/config
+  export NODE_ENV=production
+  export PEERTUBE_DB_PASSWORD=$(cat /run/secrets/db_password)
+
+  # shellcheck disable=SC2034
+  abra__service_="app"
+
+  sub_app_run npm run "$@"
+}
+
+sub_prune() {
+    info "Pruning storage"
+    info "See https://docs.joinpeertube.org/maintain-tools?id=prune-storagejs for more"
+    silence
+
+    sub_npm "prune-storage"
+
+    unsilence
+    success "Storage pruned!"
+}