.github: Add Cachix cache

.github/workflows/build.yml

@@ -21,6 +21,10 @@ jobs:
           install_url: ${{ matrix.nix.url }}
           extra_nix_config: |
             experimental-features = nix-command flakes
+      - uses: cachix/cachix-action@v10
+        with:
+          name: colmena
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
 
       - run: nix flake check
         if: ${{ !contains(matrix.nix.name, '2.3') }}
@@ -54,6 +58,10 @@ jobs:
           install_url: ${{ matrix.nix.url }}
           extra_nix_config: |
             experimental-features = nix-command flakes
+      - uses: cachix/cachix-action@v10
+        with:
+          name: colmena
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
 
       - run: nix-shell --run "cargo test"
         if: ${{ !contains(matrix.nix.name, '2.3') }}

.github/workflows/manual.yml

@@ -15,6 +15,11 @@ jobs:
           install_url: https://releases.nixos.org/nix/nix-2.4/install
           extra_nix_config: |
             experimental-features = nix-command flakes
+      - uses: cachix/cachix-action@v10
+        with:
+          name: colmena
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+
       - name: Build manual
         run: nix build -o out .#manual -L
 

README.md

@@ -33,6 +33,10 @@ To install the latest development version to the user profile, use `default.nix`
 nix-env -if default.nix
 ```
 
+### Binary Cache
+
+A public binary cache is available at https://colmena.cachix.org, courtesy of Cachix.
+
 ## Tutorial
 
 *See Tutorial with Flakes for usage with Nix Flakes.*