ci: Make docs-only PRs only trigger docs-related tests (#18744)

This should speed up any docs-only PRs so that they don't have to run the full 5 minute battery of tests.

Release Notes:

- N/A

.github/workflows/ci.yml

@@ -7,9 +7,13 @@ on:
       - "v[0-9]+.[0-9]+.x"
     tags:
       - "v*"
+    paths-ignore:
+      - "docs/**"
   pull_request:
     branches:
       - "**"
+    paths-ignore:
+      - "docs/**"
 
 concurrency:
   # Allow only one workflow per any non-`main` branch.

.github/workflows/docs.yml

@@ -20,11 +20,14 @@ jobs:
         with:
           version: 9
 
-      - run: |
+      - name: Prettier Check on /docs
+        working-directory: ./docs
+        run: |
           pnpm dlx prettier . --check || {
             echo "To fix, run from the root of the zed repo:"
             echo "  cd docs && pnpm dlx prettier . --write && cd .."
             false
           }
 
-        working-directory: ./docs
+      - name: Check spelling
+        run: script/check-spelling docs/