export the whole nix store

Author: ibbem

.github/workflows/maven.yml

@@ -18,6 +18,8 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v31
+    - name: List pre-installed store paths
+      run: find /nix/store -mindepth 1 -maxdepth 1 | sort > pre-installed
     - uses: actions/cache/restore@v4
       id: cache
       with:
@@ -28,11 +30,15 @@ jobs:
       if: steps.cache.outputs.cache-hit == 'true'
       run: |
         nix-store --import < cache-closure.nar
-    - name: Build and export cache
+    - name: Build cache
       if: steps.cache.outputs.cache-hit != 'true'
       run: |
         nix-build --out-link dependencies nix/github-workflow-dependencies.nix
-        nix-store --export $(nix-store --query --requisites dependencies) > cache-closure.nar
+    - name: Export cache
+      if: steps.cache.outputs.cache-hit != 'true'
+      run: |
+        find /nix/store -mindepth 1 -maxdepth 1 | sort > store-paths
+        nix-store --export $(comm -13 pre-installed store-paths) > cache-closure.nar
     - uses: actions/cache/save@v4
       if: steps.cache.outputs.cache-hit != 'true'
       with: