Add pre-release workflow to actions

Runs semantic release in dry-run mode on 'non-main' branches

.github/workflows/pre-release.yml

@@ -0,0 +1,29 @@
+# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Timings CI - pre-release
+
+on:
+  push:
+    branches:
+    - '!main'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Semantic Release
+      uses: cycjimmy/semantic-release-action@v3
+      id: semantic
+      with:
+        dry_run: true
+        extra_plugins: |
+          @semantic-release/changelog
+          @semantic-release/git
+          @semantic-release/npm
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        NPM_TOKEN: ${{ secrets.NPM_TOKEN }}