chore: install tzdata in the backend image

Author: openscript

.changeset/weak-tools-grow.md

@@ -0,0 +1,5 @@
+---
+"@quassel/backend": patch
+---
+
+Install tzdata in the backend image

apps/backend/Dockerfile

@@ -1,6 +1,6 @@
 FROM docker.io/node:22-slim
 RUN apt-get update && \
-    apt-get install -y dumb-init curl gnupg2 ca-certificates && \
+    apt-get install -y dumb-init curl gnupg2 ca-certificates tzdata && \
     echo "deb http://apt.postgresql.org/pub/repos/apt $(. /etc/os-release && echo $VERSION_CODENAME)-pgdg main" > /etc/apt/sources.list.d/pgdg.list && \
     curl -fsSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor -o /usr/share/keyrings/postgresql.gpg && \
     echo "deb [signed-by=/usr/share/keyrings/postgresql.gpg] http://apt.postgresql.org/pub/repos/apt $(. /etc/os-release && echo $VERSION_CODENAME)-pgdg main" > /etc/apt/sources.list.d/pgdg.list && \