Improved Publishing Process (#2)

**Pre-release**: If the Git tag matches
`v[0-9]+.[0-9]+.[0-9]+-alpha.[0-9]+` (e.g., `v1.0.0-alpha.1`), the
version is taken from the tag, and the package is published as a
pre-release.
**Stable Release**: If the Git tag matches `v[0-9]+.[0-9]+.[0-9]+`
(e.g., `v1.0.0`), the version is taken from `package.json` and published
as the latest stable version.

.github/workflows/npm.yaml

@@ -3,7 +3,8 @@ name: Publish to npm
 on:
   push:
     tags:
-      - 'v[0-9]+.[0-9]+.[0-9]+*'
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+      - 'v[0-9]+.[0-9]+.[0-9]+-alpha.[0-9]+'
 
 jobs:
   build:
@@ -18,6 +19,19 @@ jobs:
       with:
         node-version: 20.x
         cache: 'npm'
+        registry-url: 'https://registry.npmjs.org/'
+
+    - name: Determine pre-release tag
+      id: release-tag
+      run: |
+        TAG_NAME=${GITHUB_REF#refs/tags/}
+        echo "Detected tag: $TAG_NAME"
+        if [[ "$TAG_NAME" == *-alpha.* ]]; then
+          echo "tag=alpha" >> $GITHUB_ENV
+          npm version --no-git-tag-version $TAG_NAME
+        else
+          echo "tag=latest" >> $GITHUB_ENV
+        fi
 
     - name: Install dependencies
       run: npm ci
@@ -29,6 +43,6 @@ jobs:
       run: npm run compile
 
     - name: Publish
-      run: npm publish --access public
+      run: npm publish --access public --tag ${{ env.tag }}
       env:
         NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}