Cache dev shell in FlakeHub Cache

.github/workflows/flakehub-cache.yml

@@ -0,0 +1,32 @@
+name: Push dev shell to FlakeHub Cache
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  push-dev-shell-to-flakehub-cache:
+    env:
+      ACTIONS_STEP_DEBUG: true
+    runs-on: ${{ matrix.systems.runner }}
+    permissions:
+      id-token: "write"
+      contents: "read"
+    strategy:
+      matrix:
+        systems:
+          - nix-system: "aarch64-darwin"
+            runner: "macos-latest-xlarge"
+          - nix-system: "x86_64-darwin"
+            runner: "macos-12"
+          - nix-system: "x86_64-linux"
+            runner: "ubuntu-22.04"
+    steps:
+      - uses: actions/checkout@v3
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+        with:
+          use-flakehub: true
+      - name: Build dev shell for ${{ matrix.systems.nix-system }} on ${{ matrix.systems.runner }}
+        run: |
+          nix build .#devShells.${{ matrix.systems.nix-system }}.default