chore: don't touch WORKSPACE when showing bazel version

In earlier Bazel versions it was necessary to have a `WORKSPACE` file
for `bazel version` to succeed. This is not the case anymore:

> Invoking Bazel in batch mode since it is not invoked from within a workspace (below a directory having a MODULE.bazel file).

Author: nmattia

ci/container/Dockerfile

@@ -123,7 +123,7 @@ RUN mkdir -p /afl && \
 # Pre-populate the Bazel installation for root
 # (note: this is only used for bash completion; the actual bazel version comes from bazelisk)
 COPY .bazelversion /tmp/bazel/
-RUN cd /tmp/bazel && touch WORKSPACE  && bazel version
+RUN cd /tmp/bazel && bazel version
 
 COPY ./ci/container/files/generate-bazel-completion.sh /tmp/
 RUN USE_BAZEL_VERSION=$(tail -1 /tmp/bazel/.bazelversion) /tmp/generate-bazel-completion.sh && \

ci/container/TAG

@@ -1 +1 @@
-c36d2160bd403f42a8c40afce7f218a574584b508ff3a01164ef6a81446e2a16
+aa4465680d4f91d55daf796721518ec5721781f67dd0021f1d902793740acb62