Add action config for main branch

Signed-off-by: Nick Slowinski <nick@nick-slowinski.de>

.forgejo/workflows/build-deploy.yaml

@@ -0,0 +1,20 @@
+name: Build and deploy website
+on:
+  push:
+    branches:
+      - main
+  
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: registry.access.redhat.com/ubi9/nodejs-20:1-34
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Build site
+        run: npm run build