infra: create Forgejo deployment action

.forgejo/workflows/publish_site.yaml

@@ -0,0 +1,45 @@
+name: Deploy Site
+on:
+  push:
+    branches: [main]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "18"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Build posts
+        run: npm run build:posts
+
+      - name: Build project
+        run: npm run build
+
+      - name: Deploy to VPS
+        uses: appleboy/ssh-action@v0.1.5
+        with:
+          host: localhost # or localhost if connecting from the same VPS
+          username: ${{ secrets.VPS_USERNAME }}
+          key: ${{ secrets.VPS_SSH_KEY }}
+          script: |
+            rm -rf /var/www/systemsobscure.blog/*
+
+      - name: Copy files to VPS
+        uses: appleboy/scp-action@v0.1.4
+        with:
+          host: localhost # or localhost
+          username: ${{ secrets.VPS_USERNAME }}
+          key: ${{ secrets.VPS_SSH_KEY }}
+          source: "dist/*"
+          target: "/var/www/systemsobscure.blog/"
+          strip_components: 1