feat(docker): Add Buildozer to the Docker image

Buildozer is a command line tool that allows to rewrite multiple Bazel
BUILD files using standard commands. ORT is going to use it to extract
additional information from Bazel build files that is not available in the
lock file. See [1].

[1]: https://github.com/bazelbuild/buildtools/blob/main/buildozer/README.md#buildozer

Signed-off-by: Nicolas Nobelis <nicolas.nobelis@bosch.com>

Dockerfile

@@ -407,6 +407,7 @@ FROM base as bazelbuild
 ARG BAZELISK_VERSION
 
 ENV BAZEL_HOME=/opt/bazel
+ENV GOBIN=/opt/go/bin
 
 RUN mkdir -p $BAZEL_HOME/bin \
     && if [ "$(arch)" = "aarch64" ]; then \
@@ -416,8 +417,13 @@ RUN mkdir -p $BAZEL_HOME/bin \
     fi \
     && chmod a+x $BAZEL_HOME/bin/bazel
 
+COPY --from=gobuild /opt/go /opt/go
+
+RUN $GOBIN/go install github.com/bazelbuild/buildtools/buildozer@latest && chmod a+x $GOBIN/buildozer
+
 FROM scratch as bazel
 COPY --from=bazelbuild /opt/bazel /opt/bazel
+COPY --from=bazelbuild /opt/go/bin/buildozer /opt/go/bin/buildozer
 
 #------------------------------------------------------------------------
 # ORT
@@ -576,6 +582,7 @@ ENV BAZEL_HOME=/opt/bazel
 ENV PATH=$PATH:$BAZEL_HOME/bin
 
 COPY --from=bazel $BAZEL_HOME $BAZEL_HOME
+COPY --from=bazel --chown=$USER:$USER /opt/go/bin/buildozer /opt/go/bin/buildozer
 
 RUN syft $BAZEL_HOME -o spdx-json --output json=/usr/share/doc/ort/ort-bazel.spdx.json