debian-bookworm-erlang: use debian's rebar3

Use debian's version of rebar3 instead of downloading a binary. This
was useful when the container was based on debian 11 where rebar3
wasn't in debian's repositories. Debian 12 has version 3.19.0.

This also solves a caching problem on one of the jenkins nodes, which
currently fails at this line:
  ADD  https://github.com/erlang/rebar3/archive/refs/tags/${REBAR3_VERSION}.tar.gz /tmp/rebar3.tar.gz
with:
  ERROR: failed to solve: failed to load cache key: invalid not-modified ETag: "fce57989250a021a2be5fe5eddd655d6d415eef04f769bf1437f3d6dddfa5559"

My understanding is that docker has cached an ETag that is no longer
valid / maybe the format changed - and instead of simply requesting the
file again, it just fails there.

Related: https://en.wikipedia.org/wiki/HTTP_ETag
Change-Id: I69e02d004a0bd6f9d3a462f4e184b3e9361cc7fe

debian-bookworm-erlang/Dockerfile

@@ -8,25 +8,16 @@ ARG	OSMOCOM_REPO_PATH="packages/osmocom:"
 ARG	OSMOCOM_REPO="${OSMOCOM_REPO_MIRROR}/${OSMOCOM_REPO_PATH}/latest/Debian_12/"
 ARG	UID
 
-# Install the erlang vm and rebar (2)
+# Install the erlang vm and rebar (2 and 3)
 RUN	set -x && \
 	apt-get update && \
 	apt-get install -y --no-install-recommends \
 		erlang \
 		rebar \
+		rebar3 \
 		&& \
 	apt-get clean
 
-# Add rebar3
-ARG	REBAR3_VERSION="3.18.0"
-ADD	https://github.com/erlang/rebar3/archive/refs/tags/${REBAR3_VERSION}.tar.gz /tmp/rebar3.tar.gz
-RUN	set -x && \
-	tar -zxf /tmp/rebar3.tar.gz && \
-	cd rebar3-${REBAR3_VERSION} && \
-	./bootstrap && \
-	install -Dm0755 "rebar3" "/usr/bin/rebar3" && \
-	rm /tmp/rebar3.tar.gz
-
 # Install minimal build utilities as well as system utilities
 RUN	set -x && \
 	apt-get update && \