chore: install with frozen lockfile and ignore ci-generated files (#557)

Author: tvanhens

.github/actions/build/action.yml

@@ -25,7 +25,7 @@ runs:
           turbo-
 
     - name: Install dependencies
-      run: yarn install --check-files
+      run: yarn install --frozen-lockfile
       shell: bash
 
     - name: Build

.gitignore

@@ -54,3 +54,5 @@ packages/*/lib
 !/.github/workflows/close.yml
 .turbo
 lib
+.npmrc
+.turbo-cache