feat: add test for get_nfpm_arch

ci/build/build-lib.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# This is a library which contains functions used inside ci/build
+#
+# We separated it into it's own file so that we could easily unit test
+# these functions and helpers.
+
+# On some CPU architectures (notably node/uname "armv7l", default on Raspberry Pis),
+# different package managers have different labels for the same CPU (deb=armhf, rpm=armhfp).
+# This function returns the overriden arch on platforms
+# with alternate labels, or the same arch otherwise.
+get_nfpm_arch() {
+  local PKG_FORMAT="${1:-}"
+  local ARCH="${2:-}"
+
+  case "$ARCH" in
+    armv7l)
+      if [ "$PKG_FORMAT" = "deb" ]; then
+        echo armhf
+      elif [ "$PKG_FORMAT" = "rpm" ]; then
+        echo armhfp
+      fi
+      ;;
+    *)
+      echo "$ARCH"
+      ;;
+  esac
+}