flake reorg, nix integration testing

Author: icewind1991

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: "CI"
+on:
+  pull_request:
+  push:
+
+jobs:
+  matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v27
+      - id: set-matrix
+        run: echo "matrix={\"check\":$(nix eval --json '.#checks.x86_64-linux' --apply 'builtins.attrNames')}" | tee -a $GITHUB_OUTPUT
+
+  checks:
+    runs-on: ubuntu-latest
+    needs: [matrix]
+    strategy:
+      fail-fast: false
+      matrix: ${{fromJson(needs.matrix.outputs.matrix)}}
+    name: ${{ matrix.check }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v26
+      - uses: icewind1991/attic-action@v1
+        with:
+          name: ci
+          instance: https://cache.icewind.me
+          authToken: "${{ secrets.ATTIC_TOKEN }}"
+      - run: nix build .#checks.x86_64-linux.${{ matrix.check }}

.github/workflows/rust.yml

@@ -1,4 +1,3 @@
 /target
-Cargo.lock
 result
-.direnv
+.direnv