ci: re-enable nix job build, add caching, refactor

.github/actions/rust-env/action.yml

@@ -0,0 +1,10 @@
+name: Setup Rust
+description: Setup Rust environment in latest Ubuntu
+ steps:
+  runs-on: ubuntu-latest
+  steps:
+  - uses: actions/checkout@v4
+  - uses: dtolnay/rust-toolchain@stable
+  - uses: Swatinem/rust-cache@v2
+  - run: sudo apt-get update; sudo apt-get install -y libdrm-dev libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev
+

.github/workflows/build.yml

@@ -1,27 +1,32 @@
 name: "Build"
 on:
-  pull_request:
-    branches:
+workflow_dispatch:
+pull_request:
+  branches:
     - master
   push:
-    branches:
+  branches:
     - master
 jobs:
-#  build:
-#    runs-on: ubuntu-latest
-#    steps:
-#    - uses: actions/checkout@v3
-#    - uses: cachix/install-nix-action@v22
-#      with:
-#        nix_path: nixpkgs=channel:nixpkgs-unstable
-#    - run: GIT_LFS_SKIP_SMUDGE=1 nix build
-#    - run: nix flake check
-  check-features:
-    runs-on: ubuntu-latest
+  build:
+   runs-on: ubuntu-latest
+   permissions:
+     contents: read
+     id-token: write
+   steps:
+   - uses: actions/checkout@v4
+   - uses: DeterminateSystems/nix-installer-action@main
+   - uses: DeterminateSystems/magic-nix-cache-action@main
+   - run: nix flake check --print-build-logs --keep-going
+  check-no-default-features:
+    uses: ./.github/actions/rust-env
     steps:
-    - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@stable
-    - run: sudo apt-get update; sudo apt-get install -y libdrm-dev libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev
     - run: cargo check --no-default-features
+  check-debug-feature:
+    uses: ./.github/actions/rust-env
+    steps:
     - run: cargo check --features debug
+  check-profile-with-tracy-feature:
+    uses: ./.github/actions/rust-env
+    steps:
     - run: cargo check --features profile-with-tracy