Add build workflow

scripts/build-all.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -eo pipefail
+
+packages=$(nix flake show --json --all-systems| \
+           jq -r '.packages["x86_64-linux"] | keys[] | ".#packages.x86_64-linux.\(.)"')
+
+while IFS= read -r line; do
+    echo "building package $line"
+    nix build -L "$line"
+    echo "done building package $line"
+done <<< "$packages"