feat(PLT-2545): bob the builder support (#176)

Improve handling of Yarn workspaces by checking for cached node_modules
before deciding to run yarn install. Added detailed logging for
workspace detection and symlink preservation to aid in troubleshooting
during the rollout of centralized GitHub Actions across frontend
projects.

Author: kb-typeform

shared-actions/setup-node-with-cache/action.yml

@@ -78,6 +78,8 @@ runs:
       with:
         path: |
           node_modules
+          apps/**/node_modules
+          packages/**/node_modules
           ~/.cache/yarn
         key: ${{ runner.os }}-${{ runner.arch }}-yarn-${{ hashFiles('**/yarn.lock', '**/package.json') }}
         restore-keys: |
@@ -126,6 +128,8 @@ runs:
       if: ${{ !env.ACT }}
       shell: bash
       run: |
+        set +e  # Don't exit on error - we want to check all conditions
+        
         # Determine if we need to run yarn install even when cache hits.
         #
         # Why this matters:
@@ -180,14 +184,22 @@ runs:
         
         # Check for monorepo configurations that need install
         if [ "$NEEDS_INSTALL" == "false" ]; then
-          # 1. Yarn workspaces: ALWAYS need symlink creation between workspace packages
-          #    CRITICAL: Workspace symlinks are NOT preserved in GitHub Actions cache!
-          #    Even Turbo monorepos need this - Turbo handles build caching, not workspace linking.
+          # 1. Yarn workspaces: Check if workspace node_modules are cached
+          #    If we cache workspace node_modules explicitly (apps/**/node_modules, packages/**/node_modules),
+          #    then symlinks work correctly and we don't need to run yarn install.
+          #    If workspace node_modules are missing, we must run yarn install to populate them.
           if grep -q '"workspaces"' package.json 2>/dev/null; then
-            echo "📦 Detected Yarn workspaces - install needed for workspace linking"
-            echo "   ⚠️  Workspace symlinks are not preserved in cache"
-            echo "   ⚠️  Skipping install will cause 'module not found' errors"
-            NEEDS_INSTALL=true
+            # Check if workspace node_modules directories exist (were cached)
+            WORKSPACE_MODULES=$(find packages/*/node_modules apps/*/node_modules -maxdepth 0 -type d 2>/dev/null | wc -l | tr -d ' ')
+            if [ "$WORKSPACE_MODULES" -gt 0 ]; then
+              echo "✅ Yarn workspaces detected with cached node_modules ($WORKSPACE_MODULES workspaces)"
+              echo "   ✅ Workspace symlinks preserved - install NOT needed"
+              NEEDS_INSTALL=false
+            else
+              echo "⚠️ Yarn workspaces detected but workspace node_modules missing"
+              echo "   ⚠️ Install needed to populate workspace directories"
+              NEEDS_INSTALL=true
+            fi
           fi
           
           # 2. Lerna monorepo: Need lerna bootstrap (usually in postinstall hook)