chore: add semantic-release and renovate (#3)

.github/renovate.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["github>sanity-io/renovate-config"]
+}

.github/workflows/release.yml

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+name: Release
+on:
+  push:
+    branches:
+      - main
+      - alpha
+
+jobs:
+  release:
+    name: Release
+    environment:
+      name: npm-production
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read # for checkout
+      id-token: write # to enable use of OIDC for npm provenance
+    steps:
+      - name: Create app token
+        uses: actions/create-github-app-token@v1
+        id: app-token
+        with:
+          app-id: ${{ secrets.ECOSPARK_APP_ID }}
+          private-key: ${{ secrets.ECOSPARK_APP_PRIVATE_KEY }}
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # Need all history to analyze commits since last release
+          fetch-depth: 0
+          # Uses generated token to allow pushing commits back
+          token: ${{ steps.app-token.outputs.token }}
+          # Make sure GITHUB_TOKEN will not be persisted in repo's config
+          persist-credentials: false
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm t
+
+      - name: Release
+        env:
+          GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NPM_CONFIG_PROVENANCE: true
+        run: npx semantic-release

.github/workflows/test.yml

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+name: Test
+on:
+  - pull_request
+
+jobs:
+  release:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: lts/*
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm t

.releaserc.json

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+{
+  "extends": "@sanity/semantic-release-preset",
+  "branches": ["main", {"name": "alpha", "prerelease": true}]
+}