[CI] gitlab-ci cleanup, node_modules, .spago cache

.gitlab-ci.yml

-# Thanks to:
-# https://vadosware.io/post/zero-to-continuous-integrated-testing-a-haskell-project-with-gitlab/
-#
-
 # Fixing the nixos image saves CI time so it doesn't have to pull new
 #image every time (nixos/nix updates quite often).
 # image: nixos/nix:latest
 image: nixos/nix:2.22.0
 
-variables:
-  STACK_ROOT: "${CI_PROJECT_DIR}/.stack-root"
-  STACK_OPTS: "--system-ghc"
-
 #before_script:
   #- nix-env -iA nixpkgs.nix nixpkgs.cacert
   #- apt-get update
@@ -27,7 +19,6 @@ stages:
 #     paths:
 #       - /nix/store
 #       #- node_modules/
-#       #- ${CI_PROJECT_DIR}/bun.lockb
 #   script:
 #     - nix-shell shell.nix --run 'bun install --skip-builds'
 
@@ -36,10 +27,9 @@ compile:
   cache:
     paths:
       - /nix/store
-      #- node_modules/
+      - node_modules/
       - output/
-      #- .spago/
-      #- ${CI_PROJECT_DIR}/bun.lockb
+      - .spago/
     
   script:
     - nix --extra-experimental-features "nix-command flakes" run .#compile
@@ -51,10 +41,9 @@ test:
     # key: ${CI_COMMIT_REF_SLUG}
     paths:
       - /nix/store
-      #- node_modules/
+      - node_modules/
       - output/
-      #- .spago/
-      #- ${CI_PROJECT_DIR}/bun.lockb
+      - .spago/
     
   script:
     - nix --extra-experimental-features "nix-command flakes" run .#test-ps