Set up Shopify Oxygen deployment workflow file

.github/workflows/oxygen-deployment-1000018447.yml

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+# Don't change the line below!
+#! oxygen_storefront_id: 1000018447
+
+name: Storefront 1000018447
+on: [push]
+
+permissions:
+  contents: read
+  deployments: write
+
+jobs:
+  deploy:
+    name: Deploy to Oxygen
+    timeout-minutes: 30
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "lts/*"
+          check-latest: true
+
+      - name: Cache node modules
+        id: cache-npm
+        uses: actions/cache@v4
+        env:
+          cache-name: cache-node-modules
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build and Publish to Oxygen
+        run: npx shopify hydrogen deploy
+        env:
+          SHOPIFY_HYDROGEN_DEPLOYMENT_TOKEN: ${{ secrets.OXYGEN_DEPLOYMENT_TOKEN_1000018447 }}