chore: Add Smallstep `step` CLI

target/scripts/build/packages.sh

@@ -36,7 +36,17 @@ function _pre_installation_steps() {
   apt-get "${QUIET}" install --no-install-recommends "${EARLY_PACKAGES[@]}" 2>/dev/null
 }
 
+# Install third-party commands to /usr/local/bin
 function _install_utils() {
+  local ARCH_A=$(uname -m)
+  # Alternate naming convention support: x86_64 (amd64) / aarch64 (arm64)
+  # https://en.wikipedia.org/wiki/X86-64#Industry_naming_conventions
+  local ARCH_B
+  case "${ARCH_A}" in
+    ( 'x86_64' )  ARCH_B='amd64' ;;
+    ( 'aarch64' ) ARCH_B='arm64' ;;
+  esac
+
   # TIP: `*.tar.gz` releases tend to forget to reset UID/GID ownership when archiving.
   # When extracting with `tar` as `root` the archived UID/GID is kept, unless using `--no-same-owner`.
   # Likewise when the binary is in a nested location the full archived path
@@ -49,6 +59,11 @@ function _install_utils() {
   curl -sSfL "https://github.com/01mf02/jaq/releases/download/${JAQ_TAG}/jaq-$(uname -m)-unknown-linux-gnu" -o /usr/local/bin/jaq
   chmod +x /usr/local/bin/jaq
 
+  _log 'trace' 'Installing step'
+  local STEP_RELEASE='0.28.2'
+  curl -sSfL "https://github.com/smallstep/cli/releases/download/v${STEP_RELEASE}/step_linux_${STEP_RELEASE}_${ARCH_B}.tar.gz" \
+    | tar -xz --directory /usr/local/bin --no-same-owner --strip-components=2 "step_${STEP_RELEASE}/bin/step"
+
   _log 'trace' 'Installing swaks'
   # `perl-doc` is required for `swaks --help` to work:
   apt-get "${QUIET}" install --no-install-recommends perl-doc