Add CI/CD pipeline and docker-compose for deployment

- Gitea Actions workflow: test → build → push to container registry
- docker-compose.yml for host deployment (host network for PXE)
- Update example config to use container paths (/data, /etc/provisioning)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,18 @@
+services:
+  provisioning:
+    image: gitea.thewrightserver.net/josh/provisioning:latest
+    container_name: provisioning
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - ./provisioning.yaml:/etc/provisioning/provisioning.yaml:ro
+      - ./server-types.yaml:/etc/provisioning/server-types.yaml:ro
+      - ./keys:/etc/provisioning/keys:ro
+      - data:/data
+    command: ["-config", "/etc/provisioning/provisioning.yaml"]
+    cap_add:
+      - NET_ADMIN
+      - NET_RAW
+
+volumes:
+  data: