Run doc lint only if files changed

.github/workflows/lint-docs.yml

@@ -24,21 +24,6 @@ jobs:
           # ref: ${{ github.event.pull_request.head.ref }}
           fetch-depth: 0
 
-      - uses: pnpm/action-setup@v2
-        # uses version from "packageManager" field in package.json
-
-      - name: Setup Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v3
-        with:
-          cache: pnpm
-          node-version: ${{ matrix.node-version }}
-
-      - name: Install Packages
-        run: |
-          pnpm install --frozen-lockfile
-        env:
-          CYPRESS_CACHE_FOLDER: .cache/Cypress
-
       - name: Run changed-files using the fork point of a pull request
         id: changed-files-fork-point
         uses: tj-actions/changed-files@v29
@@ -48,6 +33,24 @@ jobs:
             packages/mermaid/src/docs/*
             packages/mermaid/src/docs.mts
 
+      - uses: pnpm/action-setup@v2
+        if: steps.changed-files-fork-point.outputs.only_modified == 'true'
+        # uses version from "packageManager" field in package.json
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        if: steps.changed-files-fork-point.outputs.only_modified == 'true'
+        with:
+          cache: pnpm
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install Packages
+        if: steps.changed-files-fork-point.outputs.only_modified == 'true'
+        run: |
+          pnpm install --frozen-lockfile
+        env:
+          CYPRESS_CACHE_FOLDER: .cache/Cypress
+
       - name: Run step if any file(s) in the docs folder change
         if: steps.changed-files-fork-point.outputs.only_modified == 'true'
         run: |