Add deployment pipeline with Fly.io setup

- Introduced `.woodpecker.yml` for CI/CD pipeline configuration targeting `main` branch.
- Added `fly.toml` for Fly.io deployment settings, including region and deployment checks.
- Created a `Dockerfile` for serving static files via NGINX with SPA routing setup.

fly.toml

@@ -0,0 +1,23 @@
+app = "gallus-pub"
+primary_region = "fra"
+
+[build]
+dockerfile = "Dockerfile"  # Da du mit einem Dockerfile arbeitest
+
+[http_service]
+  internal_port = 80
+  force_https = true
+  auto_stop_machines = true
+  auto_start_machines = true
+  min_machines_running = 0
+  processes = ["app"]
+
+  [[http_service.checks]]
+    interval = "10s"
+    timeout = "2s"
+    grace_period = "5s"
+    method = "GET"
+    path = "/"
+
+[experimental]
+  auto_rollback = true