chore: switch to distroless Docker runtime images

fix: match Debian releases for build

closes #297

Co-authored-by: MaticPoh <85814976+MaticPoh@users.noreply.github.com>

crates/delta/Dockerfile

@@ -2,13 +2,11 @@
 FROM ghcr.io/revoltchat/base:latest AS builder
 
 # Bundle Stage
-FROM debian:bullseye-slim
-RUN apt-get update && \
-    apt-get install -y ca-certificates && \
-    apt-get clean
+FROM gcr.io/distroless/cc-debian12:nonroot
 COPY --from=builder /home/rust/src/target/release/revolt-delta ./
 
 EXPOSE 8000
 ENV ROCKET_ADDRESS 0.0.0.0
 ENV ROCKET_PORT 8000
+USER nonroot
 CMD ["./revolt-delta"]