ci: revert to global npm install for pkglab

pnpm doesn't install platform-specific optional deps (pkglab-linux-x64)
for workspace devDeps. npm install -g handles this correctly.

Author: nikosdouvlis

.github/actions/init-blacksmith/action.yml

@@ -119,8 +119,8 @@ runs:
       run: pnpm install
       shell: bash
 
-    - name: Add node_modules/.bin to PATH
-      run: echo "${{ github.workspace }}/node_modules/.bin" >> $GITHUB_PATH
+    - name: Install pkglab
+      run: npm install -g pkglab@0.12.0
       shell: bash
 
     - name: Get Playwright Version

.github/actions/init/action.yml

@@ -119,8 +119,8 @@ runs:
       run: pnpm install
       shell: bash
 
-    - name: Add node_modules/.bin to PATH
-      run: echo "${{ github.workspace }}/node_modules/.bin" >> $GITHUB_PATH
+    - name: Install pkglab
+      run: npm install -g pkglab@0.12.0
       shell: bash
 
     - name: Get Playwright Version