refactor(ci): Split workflow into smaller steps

.drone.yml

@@ -7,13 +7,19 @@ platform:
   arch: arm64
 
 steps:
-- name: Build and check formatting
+- name: Install dependencies
   image: node:14-alpine
   commands:
     - yarn global add pnpm
     - pnpm install --frozen-lockfile
-    - pnpm build
+- name: Check formatting
+  image: node:14-alpine
+  commands:
     - pnpm format:check
+- name: Build site
+  image: node:14-alpine
+  commands:
+    - pnpm build
 - name: Deploy site
   image: alpine
   commands: