Use --immutable flag whenever "yarn install" is called by a tool

Fixes #347

Change-Id: I1b8423f9cef46a425c1ec7665c8285af10c56df6

.github/workflows/build-test.yml

@@ -16,6 +16,6 @@ jobs:
         with:
           node-version: "18"
       - name: Install dependencies
-        run: yarn --frozen-lockfile
+        run: yarn --immutable
       - name: Run tests
         run: yarn test

.github/workflows/edge_ghpage.yml

@@ -16,7 +16,7 @@ jobs:
           node-version: "18"
       - name: Install and Build 🔧
         run: |
-          yarn install
+          yarn install --immutable
           yarn build
 
       - name: Deploy 🚀

.github/workflows/github-release.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: "18"
-      - run: yarn install
+      - run: yarn install --immutable
       - run: yarn build
       - run: |
           version=`git describe --dirty --tags || echo unknown`