Add build workflow

.forgejo/workflows/build.yaml

@@ -0,0 +1,14 @@
+name: Build website
+on: [push]
+
+jobs:
+    Explore-Gitea-Actions:
+        runs-on: node:lts
+        steps:
+            - uses: actions/checkout@v3
+            - run: npm install
+            - run: npm run build
+            - uses: actions/upload-artifact@v3
+              with:
+                  name: site
+                  path: public