fix: force clean install when yalc fallback is triggered

When switching from yalc link to file link, remove yarn.lock and
cached node_modules to ensure yarn install picks up the new link.
Add --force flag to yarn install to bypass cache completely.

Author: MSACC

.github/workflows/tests.yml

@@ -46,9 +46,12 @@ jobs:
           if [ ! -d ".yalc/strapi-plugin-config-sync" ]; then
             echo "Yalc link failed, using file link as fallback"
             sed -i 's|"strapi-plugin-config-sync": "link:.yalc/strapi-plugin-config-sync"|"strapi-plugin-config-sync": "file:.."|' package.json
+            # Remove lock and cache to ensure fresh install
+            rm -f yarn.lock
+            rm -rf node_modules/strapi-plugin-config-sync
           fi
       - name: Install dependencies playground
-        run: cd playground && yarn install --unsafe-perm
+        run: cd playground && yarn install --unsafe-perm --force
       - name: Build playground
         run: yarn playground:build
       # - name: Run unit tests