use --immutable

.circleci/config.yml

@@ -118,7 +118,7 @@ jobs:
             - prettydocs-cache-v7--{{ checksum "yarn.lock" }}
       - run:
           name: Install
-          command: yarn install
+          command: yarn install --immutable
       - save_cache:
           name: Save Yarn cache
           key: prettydocs-cache-v7--{{ checksum "yarn.lock" }}
@@ -262,7 +262,7 @@ jobs:
           workflow-name: << pipeline.parameters.workflow >>
       - run:
           name: install
-          command: yarn install
+          command: yarn install --immutable
       - run:
           name: Compile
           command: |

.github/workflows/tests-unit.yml

@@ -25,7 +25,7 @@ jobs:
           node-version-file: '.nvmrc'
 
       - name: install
-        run: yarn install --frozen-lockfile
+        run: yarn install --immutable
 
       - name: compile
         run: yarn task --task compile --start-from=auto