Use the "prepare" script only when necessary

Since package.json contains a "prepare" life cycle script which invokes
the build, all invocations of `npm ci` and some other scripts will also
build Auspice, even if the build is not used in some CI jobs.

Use --ignore-scripts to skip all life cycle scripts and explicitly call
npm run build when the build is necessary. This should improve build
times, especially for the "build" job which was effectively running the
build twice.

Note that `npm ci --ignore-scripts && npm run build` is NOT the same as
`npm ci` alone, since --ignore-scripts also ignores life cycle scripts
defined by dependencies. This is why `npm ci` is still necessary for
smoke-test even though it doesn't explicitly require the Auspice build.

.github/workflows/ci.yaml

@@ -19,8 +19,8 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
       - run: node --version
+      # Build is implicit with the "prepare" life cycle script
       - run: npm ci
-      - run: npm run build
 
   unit-test:
     runs-on: ubuntu-latest
@@ -33,7 +33,7 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
       - run: node --version
-      - run: npm ci
+      - run: npm ci --ignore-scripts
       - run: npm test
 
   smoke-test:
@@ -60,7 +60,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node }}
-      - run: npm ci
+      - run: npm ci --ignore-scripts
       - run: npm run lint
 
   bundlesize: