add a script to get a flamegraph of collab in production (#8972)

Add `./script/collab-flamegraph` so you can profile in production (or
staging)

Release Notes:

- N/A

Dockerfile

@@ -22,7 +22,8 @@ RUN --mount=type=cache,target=./target \
 # Copy collab server binary to the runtime image
 FROM debian:bookworm-slim as runtime
 RUN apt-get update; \
-    apt-get install -y --no-install-recommends libcurl4-openssl-dev ca-certificates linux-perf
+    apt-get install -y --no-install-recommends libcurl4-openssl-dev ca-certificates \
+    linux-perf binutils
 WORKDIR app
 COPY --from=builder /app/collab /app/collab
 COPY --from=builder /app/crates/collab/migrations /app/migrations