[CI] experimental nix copy --to/from /tmp/nix-cache

.gitlab-ci.yml

@@ -35,31 +35,41 @@ compile:
   stage: compile
   cache:
     paths:
-      - /nix/store
+      - /tmp/nix-cache
+      #- /nix/store
       #- node_modules/
       - output/
       #- .spago/
       #- ${CI_PROJECT_DIR}/bun.lockb
   script:
+    # restore old cache
+    - nix copy --from 'file:///tmp/nix-cache'
+    
     - nix --extra-experimental-features "nix-command flakes" run .#fix-bun
     #- nix-shell shell.nix --run fix-bun
     - nix --extra-experimental-features "nix-command flakes" run .#compile
     #- nix-shell shell.nix --run compile
 
+    # store cache
+    - nix copy --to 'file:///tmp/nix-cache' .#build
+
 test:
   stage: test
   cache:
     # cache per branch name
     # key: ${CI_COMMIT_REF_SLUG}
     paths:
-      - /nix/store
+      - /tmp/nix-cache
+      #- /nix/store
       #- node_modules/
       - output/
       #- .spago/
       #- ${CI_PROJECT_DIR}/bun.lockb
   script:
+    # restore old cache
+    - nix copy --from 'file:///tmp/nix-cache'
+    
     - nix --extra-experimental-features "nix-command flakes" run .#fix-bun
     #- nix-shell shell.nix --run fix-bun
     - nix --extra-experimental-features "nix-command flakes" run .#test-ps
     #- nix-shell shell.nix --run test-ps
-