[build] Add gpg keys for sonic-slave-bullseye in arm64 cross build on…

… amd64. (sonic-net#17182) (sonic-net#17828)

Fix sonic-net#16204

Microsoft ADO (number only): 25746782

How I did it
multiarch/debian-debootstrap:arm64-bullseye is too old.
It needs to add some gpg keys before 'apt-get update'

sonic-slave-bullseye/Dockerfile.j2

@@ -80,6 +80,13 @@ RUN PATH=/python_virtualenv/env3/bin/:$PATH python3 -m pip uninstall -y enum34
 RUN PATH=/python_virtualenv/env3/bin/:$PATH pip3 install --force-reinstall --no-cache-dir coverage
 {%- endif %}
 
+{%- if CONFIGURED_ARCH == "arm64" and MULTIARCH_QEMU_ENVIRON == "y" %}
+# multiarch/debian-debootstrap:arm64-bullseye is too old. It needs to install keys
+RUN apt-get update || apt-get install -y gnupg
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6ED0E7B82643E131
+{%- endif %}
+
 RUN apt-get update && apt-get install -y \
         apt-utils \
         default-jre-headless \