build: Use nix for pushing to RTD

.github/workflows/ci.yml

@@ -134,12 +134,21 @@ jobs:
     steps:
       - name: Checkout repo
         uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v27
         with:
-          # Ensure all git history is cloned, so we can infer the correct version in Docker.
-          fetch-depth: 0
+          nix_path: nixpkgs=flake:nixpkgs
 
-      - name: Trigger ReadTheDocs build
+      - name: Install Cachix
+        uses: cachix/cachix-action@v15
+        with:
+          name: bow
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+
+      - name: Push to ReadTheDocs
         env:
-          RTD_TOKEN: ${{ secrets.RTD_TOKEN }}
-        run: |
-          make docs-rtd
+          RTD_BUILD_API_URL: https://readthedocs.org/api/v3/projects/volt/versions/latest/builds/
+        run: >
+          nix develop .#ci --command
+          curl -X POST -H "Authorization: Token ${{ secrets.RTD_TOKEN }}" ${RTD_BUILD_API_URL}

flake.nix

@@ -34,6 +34,7 @@
         };
         shellPkgs = with pkgs; [
           pythonEnv
+          curl
           deadnix
           nixfmt-rfc-style
           pre-commit