feat(core/gitea): add docker-compose.yml

Dokumentiert den laufenden Gitea-Stack im Repo (GitOps-Migration Sprint 4).
SSH-Port 222 bleibt als dokumentierte Ausnahme.

core/gitea/docker-compose.yml

@@ -0,0 +1,34 @@
+services:
+  gitea:
+    image: gitea/gitea:latest
+    container_name: gitea
+    restart: unless-stopped
+    security_opt:
+      - no-new-privileges:true
+    environment:
+      TZ: Europe/Berlin
+      GITEA__DEFAULT__APP_NAME: KalliLab Gitea
+      GITEA__server__DOMAIN: git.kaleschke.info
+      GITEA__server__ROOT_URL: https://git.kaleschke.info
+      GITEA__server__HTTP_PORT: 3000
+      GITEA__server__SSH_DOMAIN: git.kaleschke.info
+      GITEA__server__SSH_PORT: 222
+      GITEA__server__START_SSH_SERVER: "true"
+    volumes:
+      - /mnt/user/appdata/gitea:/data
+    ports:
+      - "222:22"
+    networks:
+      - frontend_net
+    labels:
+      - traefik.enable=true
+      - traefik.docker.network=frontend_net
+      - traefik.http.routers.gitea.rule=Host(`git.kaleschke.info`)
+      - traefik.http.routers.gitea.entrypoints=websecure
+      - traefik.http.routers.gitea.tls=true
+      - traefik.http.routers.gitea.tls.certresolver=le
+      - traefik.http.services.gitea.loadbalancer.server.port=3000
+
+networks:
+  frontend_net:
+    external: true