fix gh action indent

.github/workflows/main.yml

@@ -8,30 +8,30 @@ jobs:
   build-nix:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.3.4
 
-    - name: Install Nix
-      uses: cachix/install-nix-action@v13
-      with:
-        install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
-        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
-        extra_nix_config: |
-          experimental-features = nix-command flakes
-          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Install Nix
+        uses: cachix/install-nix-action@v13
+        with:
+          install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
+          install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
 
-    - name: Build with cachix
-      uses: cachix/cachix-action@v10
-      with:
-        name: hakyll-nix-template
-        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build with cachix
+        uses: cachix/cachix-action@v10
+        with:
+          name: hakyll-nix-template
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
 
-    - run: nix build
+      - run: nix build
 
-    - name: Artifact pages
-      uses: actions/upload-artifact@v2
-      with:
-        name: pages
-        path: result/dist
+      - name: Artifact pages
+        uses: actions/upload-artifact@v2
+        with:
+          name: pages
+          path: result/dist
 
   deploy:
     if: github.ref == 'refs/heads/main'