Try npm install in CI.

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
       # Install npm packages, unless we restored them from cache.
       # Since `npm ci` removes the node_modules folder before running it’s
       # important to skip this step if cache was restored.
-      - name: npm ci
+      - name: npm install
         if: steps.cache-node_modules.outputs.cache-hit != 'true'
         env:
           # If you have a `"postinstall": "elm-tooling install"` script in your
@@ -55,7 +55,7 @@ jobs:
           # package-lock.json does not, the postinstall script needs running
           # but this step won’t.
           NO_ELM_TOOLING_INSTALL: 1
-        run: npm ci
+        run: npm install
       - name: elm-tooling install
         run: npx --no-install elm-tooling install
       - name: Add elm-review, elm and elm-format to path