chore(ci): add tag script

Signed-off-by: Matt Roberts <code@rbrts.uk>

Author: mttrbrts

.github/workflows/npm-publish.yml

@@ -32,7 +32,13 @@ jobs:
       - run: npm ci
       - run: npm run build --if-present
 
+      - name: tag
+        id: tag
+        run: |
+          node ./scripts/tag.js ${{ github.event.release.tag_name }}
+
+
       - name: publish
         run: |
-          npm version --no-git-tag-version --yes --exact ${{ steps.timestamp.outputs.stamp }}
+          npm version --no-git-tag-version --yes --exact ${{ github.event.release.tag_name }}
           npm publish --access public --provenance ${{ steps.tag.outputs.tag }} 2>&1

scripts/tag.js

@@ -0,0 +1,29 @@
+#!/usr/bin/env node
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+'use strict';
+
+const semver = require('semver');
+const targetVersion = process.argv[2];
+
+if (!semver.valid(targetVersion)) {
+    console.error(`Error: the version "${targetVersion}" is invalid!`);
+    process.exit(1);
+}
+
+const prerelease = semver.prerelease(targetVersion);
+const tag = prerelease ? 'unstable' : 'latest';
+
+console.log(`::set-output name=tag::--tag=${tag}`);