Fix discrepancies between our BUILDER image and FROM image in Dockerfile.
rust:1.55 switched from debian buster to debian bullseye.
-FROM rust:1.55.0 as builder
+FROM rust:1.55-bullseye as builder
# Avoid warnings by switching to noninteractive
ENV DEBIAN_FRONTEND=noninteractive
@@ -43,7 +43,7 @@ RUN cat /proc/cpuinfo
RUN cargo build --release --all --verbose
RUN strip target/release/tremor
-FROM debian:buster-slim
+FROM debian:bullseye-slim
RUN useradd -ms /bin/bash tremor
