🚧 dev: add alpha release script

.github/workflows/alpha.yml

@@ -0,0 +1,55 @@
+name: Release (Alpha)
+on:
+  workflow_dispatch:
+    inputs:
+      preid:
+        description: 'Pre-release identifier (e.g., alpha.1)'
+        required: true
+        type: string
+      dry_run:
+        description: 'Dry run (no actual publish)'
+        type: boolean
+        default: false
+
+jobs:
+  alpha:
+    name: Release alpha
+    runs-on: ubuntu-latest
+    # Require explicit environment approval
+    environment:
+      name: alpha-release
+      url: https://www.npmjs.com/package/@coinbase/onchainkit
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: 'Setup'
+        uses: ./.github/actions/setup
+
+      - name: Set version
+        run: |
+          BRANCH_NAME=$(echo ${GITHUB_REF#refs/heads/} | tr -cs '[:alnum:]-' '-' | tr '[:upper:]' '[:lower:]')
+          npm --no-git-tag-version version $(npm pkg get version | sed 's/"//g')-${BRANCH_NAME}.$(echo ${{ github.event.inputs.preid }})
+
+      - name: Build
+        shell: bash
+        run: yarn build
+
+      - name: Test package
+        if: ${{ inputs.dry_run }}
+        run: npm publish --dry-run --tag alpha
+
+      - name: Set deployment token
+        if: ${{ !inputs.dry_run }}
+        run: npm config set '//registry.npmjs.org/:_authToken' "${{ secrets.NPM_TOKEN }}"
+
+      - name: Publish to npm
+        if: ${{ !inputs.dry_run }}
+        run: npm publish --tag alpha
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}