Drop the dist/ verification from the main CI build

... and rename it to `ci`.

The verification is no longer needed because the idea is to build and
commit this directory _only_ in the workflow that publishes `main` to
the `v0` release branch.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

.github/workflows/ci.yml

@@ -0,0 +1,18 @@
+name: Run the tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - run: npm ci
+      - run: npm run lint
+      - run: npm run test
+      - run: npm run prepare