Changing to rust1.91-slim instead to ensure we don't have any issues

Author: bgrahammonf

backend/Dockerfile_build_and_publish

@@ -25,7 +25,7 @@ COPY . .
 RUN cargo build --release --bin backend
 
 # Runtime stage
-FROM debian:trixie-slim AS runtime
+FROM rust:1.91-slim AS runtime
 
 # Install runtime dependencies
 RUN apt-get update && apt-get install -y \