Add Gitea Actions CI and release workflows and deployment assets

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

deploy/docker-compose.yml

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+# Run Blacktip with Docker on a public server:
+#   cp .env.example .env     (then set BLACKTIP_HAMMERHEAD and BLACKTIP_TOKEN)
+#   docker compose up -d
+#
+# Host networking is needed so Blacktip can open ports on the machine's own IP
+# addresses (including the same port on different IPs). Open the WireGuard UDP port
+# (51820 by default) and every port you create in the dashboard in the firewall.
+services:
+  blacktip:
+    image: git.veillax.com/veillax/blacktip:latest
+    restart: unless-stopped
+    network_mode: host
+    env_file: .env
+    volumes:
+      - blacktip-data:/data
+      # To list this machine's Docker containers as targets (BLACKTIP_DOCKER=1):
+      # - /var/run/docker.sock:/var/run/docker.sock:ro
+      # To serve websites with Traefik (BLACKTIP_TRAEFIK=/traefik): mount a Traefik v3 binary
+      # - /usr/local/bin/traefik:/traefik:ro
+
+volumes:
+  blacktip-data: