fix(deployment): make bootstrap architecture-aware

The Ubuntu bootstrap script assumes x86 as the target architecture.  When running on Arm, the installation of the step CLI package breaks.

deployments/native/bootstrap/ubuntu.sh

@@ -1,14 +1,17 @@
 #!/bin/sh
 # Copyright 2024 Contributors to the Veraison project.
 # SPDX-License-Identifier: Apache-2.0
+
+arch=$(dpkg --print-architecture)
+
 sudo apt update
 sudo apt install --yes git protobuf-compiler golang-1.22 make gettext sqlite3 openssl jq
 
 sudo ln -s /usr/lib/go-1.22/bin/go /usr/local/bin/go
 sudo ln -s /usr/lib/go-1.22/bin/gofmt /usr/local/bin/gofmt
 
-wget https://dl.smallstep.com/cli/docs-cli-install/latest/step-cli_amd64.deb -O /tmp/step-cli_amd64.deb
-sudo dpkg -i /tmp/step-cli_amd64.deb
+wget https://dl.smallstep.com/cli/docs-cli-install/latest/step-cli_${arch}.deb -O /tmp/step-cli_${arch}.deb
+sudo dpkg -i /tmp/step-cli_${arch}.deb
 
 go install google.golang.org/protobuf/cmd/[email protected]
 go install google.golang.org/grpc/cmd/[email protected]