ci(docs): install docs dependencies separately in workflows

Author: lempira

.github/workflows/docs-preview.yml

@@ -34,6 +34,9 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Install docs dependencies
+        run: npm ci --prefix docs
+
       - name: Build documentation
         run: npm run docs:build
 

.github/workflows/pr.yml

@@ -39,6 +39,9 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Install docs dependencies
+        run: npm ci --prefix docs
+
       - name: Verify documentation builds
         run: npm run docs:build
 

.github/workflows/release.yml

@@ -48,6 +48,9 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Install docs dependencies
+        run: npm ci --prefix docs
+
       - name: Verify documentation builds
         run: npm run docs:build
 
@@ -138,6 +141,9 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Install docs dependencies
+        run: npm ci --prefix docs
+
       - name: Build documentation
         run: npm run docs:build