ci: prebuild and push to cache

.gitlab-ci.yml

@@ -2,8 +2,37 @@
 
 # only a deploy stage
 stages:
+  - build
   - deploy
 
+.scripts_base: &scripts_base
+  - nix --extra-experimental-features 'nix-command flakes' profile install nixpkgs#bash
+
+.scripts_cache: &scripts_cache
+  - nix --extra-experimental-features 'nix-command flakes' profile install nixpkgs#attic-client
+  - attic login skynet https://nix-cache.skynet.ie/ $CACHE_KEY
+  - attic use skynet-cache
+
+build:
+  tags:
+    - nix
+  before_script:
+    - *scripts_base
+    - *scripts_cache
+  stage: build
+
+  # when it runs
+  rules:
+    - if: '$CI_PROJECT_NAMESPACE == "compsoc1/compsoc" && $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
+      changes:
+        - src/**/*
+
+  # what it runs
+  script:
+    # cache any dependencies
+    - attic watch-store skynet-cache &
+    - nix --extra-experimental-features 'nix-command flakes' build
+
 
 nixos:
   stage: deploy

flake.nix

@@ -9,6 +9,15 @@
     bfom.url = "gitlab:silver_rust/bfom";
   };
 
+  /*
+  sudo nano /etc/nix/nix.conf
+  trusted-users = {username}
+  */
+  nixConfig = {
+    extra-substituters = "https://nix-cache.skynet.ie/skynet-cache";
+    extra-trusted-public-keys = "skynet-cache:OdfA4Or0JcHiHf05fsiIR4nZT2z2yDEtkoLqhntGAz4=";
+  };
+
   outputs = { self, nixpkgs, bfom,  ... } @inputs:
     let
       pkgs = nixpkgs.legacyPackages.x86_64-linux.pkgs;