feat(ci/cachix): add cachix as garnix fallback

.github/workflows/cachix.yml

@@ -0,0 +1,46 @@
+name: "Cachix build"
+on:
+  check_run:
+    types:
+      - completed
+jobs:
+  # debug-info:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #     - uses: cachix/install-nix-action@v25
+  #       with:
+  #         nix_path: nixpkgs=channel:nixos-unstable
+
+  #     - name: Print environment variables
+  #       run: env
+
+  #     - name: Print current directory
+  #       run: pwd
+
+  #     - name: List files in current directory
+  #       run: ls -al
+
+  #     - name: Print Nix version
+  #       run: nix --version
+
+  #     - name: Print event data
+  #       run: 'echo "Event payload: ${{ toJson(github.event) }}"'
+
+  #     - name: Debug condition
+  #       run: 'echo "Check name: ${{ github.event.check_run.name }}, conclusion: ${{ github.event.check_run.conclusion }}"'
+
+  build-and-cache:
+    if: ${{ github.event.check_run.name == 'Evaluate flake.nix' && github.event.check_run.conclusion == 'failure' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v25
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v14
+        with:
+          name: freesmlauncher
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - run: nix-build | cachix push freesmlauncher
+      - run: nix-shell --run "echo OK"

README.md

@@ -1,16 +1,16 @@
 <div align="center">
   <br />
-  
+
   <div>
     <img align="center" alt="DRM Free" src="https://img.shields.io/badge/drm-free-d33?style=for-the-badge">
   </div>
-  
+
   <br />
 
   <p>
     <strong>English</strong> | <a href="https://github.com/FreesmTeam/FreesmLauncher/blob/develop/README_russian.md">Русский</a><br />
   </p>
-  
+
   <p>
     Freesm Launcher is a custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once and login with offline account without any restrictions.<br />
     <br />This is a <b>fork</b> of the Prism Launcher and is <b>not</b> endorsed by it. <!-- isn't it good? :) -->

nix/README.md

@@ -2,6 +2,9 @@
 > We are using Garnix CI for binary caching.
 > Proceed to read [this](https://garnix.io/docs/caching),
 > if you want to add binary cache manually.
+>
+> Also we using [Cachix](https://app.cachix.org/cache/freesmlauncher#pull) as fallback for binary caching.
+> Read more about it [here](https://docs.cachix.org/getting-started#using-binaries-with-nix).
 
 <h3 align="center"> Using on nixos / nixpkgs </h3>
 Freesm isn't in `nixpkgs` (yet?), so you need to add Freesm in `flake.nix`:
@@ -18,13 +21,13 @@ Freesm isn't in `nixpkgs` (yet?), so you need to add Freesm in `flake.nix`:
             };
         };
     };
-    outputs = { 
-        self, 
+    outputs = {
+        self,
         nixpkgs,
         home-manager,
         freesmlauncher,
         ...
-    } @ inputs : 
+    } @ inputs :
     ... # rest of flake.
 }
 ```