feat(workflows/eval): Try to build and upload in one fell swoop

scripts/cache-node.sh

@@ -0,0 +1,20 @@
+set -eu -o pipefail
+
+cat <<EOF >.netrc
+default
+login $STORE_USER
+password $STORE_PASSWORD
+EOF
+
+drv=$("@colmena@/bin/colmena" eval --instantiate -E "{ nodes, ... }: nodes.${BUILD_NODE}.config.system.build.toplevel")
+
+# Build the derivation and send it to the great beyond
+nix-store --query --requisites --force-realise --include-outputs "$drv" | grep -v '.*\.drv' >paths.txt
+
+nix copy \
+  --extra-experimental-features nix-command \
+  --to "$STORE_ENDPOINT?compression=none" \
+  --netrc-file .netrc \
+  "$(nix-store --realise "$drv")"
+
+rm .netrc

scripts/default.nix

@@ -29,6 +29,7 @@ let
     ));
 
   scripts = [
+    "cache-node"
     "check-deployment"
     "launch-vm"
     "list-nodes"