fix open-vm-tools installation in debian11

Signed-off-by: fgierlinger <2966031+fgierlinger@users.noreply.github.com>

packer_templates/scripts/_common/vmware_debian_ubuntu.sh

@@ -2,7 +2,16 @@
 
 case "$PACKER_BUILDER_TYPE" in
 vmware-iso|vmware-vmx)
+    # determine the major Debian version we're runninng
+    major_version="$(grep VERSION_ID /etc/os-release | awk -F= '{print $2}' | tr -d '"')"
+    architecture="$(uname -m)"
+
+    # open-vm-tools for amd64 are only available in bullseye-backports repo
     echo "install open-vm-tools"
+    if [ "$major_version" -eq 11 ] && [ "$architecture" = "aarch64" ]; then
+        echo 'deb http://deb.debian.org/debian bullseye-backports main' >> /etc/apt/sources.list
+        apt-get update
+    fi
     apt-get install -y open-vm-tools;
     mkdir /mnt/hgfs;
     systemctl enable open-vm-tools