Add Vercel production deployment workflow and configure Hugo

Vercel seems to have an old version of Hugo which leads to errors. Setting an environment variable can override this.

.gitea/workflows/vercel-production.yaml

@@ -0,0 +1,21 @@
+name: Vercel Production Deployment
+env:
+  VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+  VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
+on:
+  push:
+    branches:
+      - main
+jobs:
+  Deploy-Production:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Vercel CLI
+        run: npm install --global vercel@latest
+      - name: Pull Vercel Environment Information
+        run: vercel pull --yes --environment=production --token=${{ secrets.VERCEL_TOKEN }}
+      - name: Build Project Artifacts
+        run: vercel build --prod --token=${{ secrets.VERCEL_TOKEN }}
+      - name: Deploy Project Artifacts to Vercel
+        run: vercel deploy --prebuilt --prod --token=${{ secrets.VERCEL_TOKEN }}

vercel.json

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+{
+    "build": {
+        "env": {
+            "HUGO_VERSION": "0.125.3"
+        }
+    }
+}