feat: Add bssh-keygen to Debian package build pipeline

- Updated debian_build.yml to include bssh-keygen in package matrix
- Created debian/control.bssh-keygen.binary for package metadata
- Created debian/rules.bssh-keygen.binary for binary installation
- bssh-keygen packages will be built for all distros (jammy, noble, resolute) and architectures (amd64, arm64)

Author: inureyes

.github/workflows/debian_build.yml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        package: [bssh, bssh-server]
+        package: [bssh, bssh-server, bssh-keygen]
         distro: [jammy, noble, resolute]
         arch: [amd64, arm64]
         include:
@@ -81,6 +81,12 @@ jobs:
           - arch: arm64
             package: bssh-server
             binary_asset: bssh-server-linux-aarch64.tar.gz
+          - arch: amd64
+            package: bssh-keygen
+            binary_asset: bssh-keygen-linux-x86_64.tar.gz
+          - arch: arm64
+            package: bssh-keygen
+            binary_asset: bssh-keygen-linux-aarch64.tar.gz
 
     steps:
     # ───────────────────────────────────────────────────────────────

debian/control.bssh-keygen.binary

@@ -0,0 +1,28 @@
+Source: bssh
+Section: utils
+Priority: optional
+Maintainer: Jeongkyu Shin <inureyes@gmail.com>
+Build-Depends: debhelper-compat (= 13), build-essential
+Standards-Version: 4.6.2
+Homepage: https://github.com/lablup/bssh
+Vcs-Browser: https://github.com/lablup/bssh
+Vcs-Git: https://github.com/lablup/bssh.git
+Rules-Requires-Root: no
+
+Package: bssh-keygen
+Architecture: amd64 arm64
+Depends: ${shlibs:Depends}, ${misc:Depends}
+Description: Backend.AI SSH Key Generation Utility
+ bssh-keygen is a utility for generating and managing SSH keys,
+ built with Rust as part of the bssh project. It provides:
+ .
+  * SSH key pair generation
+  * Support for multiple key formats (RSA, ECDSA, Ed25519, etc.)
+  * Key fingerprint display and verification
+  * Integration with SSH agent
+  * Secure key management
+ .
+ This package is part of the Backend.AI bssh project for parallel
+ SSH command execution across cluster nodes.
+ .
+ Developed and maintained as part of the Backend.AI project.

debian/rules.bssh-keygen.binary

@@ -0,0 +1,30 @@
+#!/usr/bin/make -f
+
+# Enable all hardening options
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	# No build needed - using pre-built binary
+	@echo "Using pre-built binary from GitHub release"
+
+override_dh_auto_install:
+	# Install the pre-built bssh-keygen binary
+	# The binary should be extracted to the project root before building the package
+	install -D -m 0755 bssh-keygen debian/bssh-keygen/usr/bin/bssh-keygen
+	# Install man page if present
+	if [ -f bssh-keygen.1 ]; then \
+		install -D -m 0644 bssh-keygen.1 debian/bssh-keygen/usr/share/man/man1/bssh-keygen.1; \
+	fi
+
+override_dh_auto_test:
+	# Skip tests for pre-built binary
+	@echo "Skipping tests - using pre-built binary"
+
+override_dh_auto_clean:
+	@echo "Skipping clean step because we use pre-built binary"
+
+override_dh_builddeb:
+	dh_builddeb --destdir=../