Replace Docker secrets with host bind mounts for SSH keys

Keys are now mounted directly from /root/.ssh/ on the host node
instead of using Docker Swarm secrets. CI deploy step simplified
to verify key files exist and clean up leftover secrets.

Co-authored-by: Cursor <cursoragent@cursor.com>

.woodpecker.yml

@@ -112,12 +112,6 @@ steps:
         from_secret: REGISTRY_USER
       REGISTRY_PASSWORD:
         from_secret: REGISTRY_PASSWORD
-      TUNNEL_SSH_HOST_KEY:
-        from_secret: tunnel_ssh_host_key
-      TUNNEL_AUTHORIZED_KEYS:
-        from_secret: tunnel_authorized_keys
-      TUNNEL_TRAEFIK_DEPLOY_KEY:
-        from_secret: tunnel_traefik_deploy_key
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
     commands:
@@ -126,26 +120,21 @@ steps:
       - HOSTNAME=$(docker info --format "{{.Name}}")
       - echo "Deploying on $HOSTNAME"
       - echo "$${REGISTRY_PASSWORD}" | docker login -u "$${REGISTRY_USER}" --password-stdin git.nixc.us
+      # Clean up any leftover Docker secrets from previous deployments
+      - docker secret rm tunnel_ssh_host_key 2>/dev/null || true
+      - docker secret rm tunnel_authorized_keys 2>/dev/null || true
+      - docker secret rm tunnel_traefik_deploy_key 2>/dev/null || true
       # Remove old stack
       - echo "Removing old stack..."
       - docker stack rm better-argo-tunnels || true
       - sleep 10
-      # Refresh secrets
+      # Verify host key files exist on the node
       - |
-        echo "Refreshing Docker secrets"; \
-        if [ -z "$${TUNNEL_SSH_HOST_KEY}" ] || [ -z "$${TUNNEL_AUTHORIZED_KEYS}" ] || [ -z "$${TUNNEL_TRAEFIK_DEPLOY_KEY}" ]; then \
-          echo "ERROR: Required secrets are empty. Aborting."; exit 1; \
-        fi; \
-        docker secret rm tunnel_ssh_host_key 2>/dev/null || true; \
-        docker secret rm tunnel_authorized_keys 2>/dev/null || true; \
-        docker secret rm tunnel_traefik_deploy_key 2>/dev/null || true; \
-        sleep 3; \
-        echo "$${TUNNEL_SSH_HOST_KEY}" | docker secret create tunnel_ssh_host_key -; \
-        echo "$${TUNNEL_AUTHORIZED_KEYS}" | docker secret create tunnel_authorized_keys -; \
-        echo "$${TUNNEL_TRAEFIK_DEPLOY_KEY}" | docker secret create tunnel_traefik_deploy_key -; \
-        echo "Secrets created:"; \
-        docker secret ls | grep tunnel_
-      # Deploy stack
+        echo "Verifying host key files..."; \
+        docker run --rm -v /root/.ssh:/check:ro alpine sh -c \
+          'ls -la /check/tunnel_host_key /check/authorized_keys /check/ca-userkey /check/ca-userkey-cert.pub' \
+        || { echo "ERROR: Required key files missing from /root/.ssh/ on host"; exit 1; }
+      # Deploy stack (keys are bind-mounted from /root/.ssh/ on the host)
       - echo "Deploying stack..."
       - docker stack deploy --with-registry-auth -c ./stack.production.yml better-argo-tunnels
     when:

stack.production.yml

@@ -2,38 +2,20 @@ networks:
   traefik:
     external: true
 
-secrets:
-  tunnel_ssh_host_key:
-    external: true
-  tunnel_authorized_keys:
-    external: true
-  tunnel_traefik_deploy_key:
-    external: true
-
 services:
   tunnel-server:
     image: git.nixc.us/colin/better-argo-tunnels:production
     networks:
       - traefik
-    secrets:
-      - source: tunnel_ssh_host_key
-        target: host_key
-        mode: 0400
-      - source: tunnel_authorized_keys
-        target: authorized_keys
-        mode: 0440
-      - source: tunnel_traefik_deploy_key
-        target: traefik_deploy_key
-        mode: 0400
     environment:
       SSH_PORT: "2222"
       PORT_RANGE_START: "10000"
       PORT_RANGE_END: "10100"
-      SSH_HOST_KEY: "/run/secrets/host_key"
-      AUTHORIZED_KEYS: "/run/secrets/authorized_keys"
+      SSH_HOST_KEY: "/keys/host_key"
+      AUTHORIZED_KEYS: "/keys/authorized_keys"
       TRAEFIK_SSH_HOST: "ingress.nixc.us:65522"
       TRAEFIK_SSH_USER: "root"
-      TRAEFIK_SSH_KEY: "/run/secrets/traefik_deploy_key"
+      TRAEFIK_SSH_KEY: "/keys/deploy_key"
       SWARM_SERVICE_NAME: "better-argo-tunnels_tunnel-server"
       TRAEFIK_ENTRYPOINT: "websecure"
       TRAEFIK_CERT_RESOLVER: "letsencryptresolver"
@@ -42,6 +24,11 @@ services:
       SERVICE_NAME: "{{.Service.Name}}"
       TASK_ID: "{{.Task.ID}}"
       ENVIRONMENT: "production"
+    volumes:
+      - /root/.ssh/tunnel_host_key:/keys/host_key:ro
+      - /root/.ssh/authorized_keys:/keys/authorized_keys:ro
+      - /root/.ssh/ca-userkey:/keys/deploy_key:ro
+      - /root/.ssh/ca-userkey-cert.pub:/keys/deploy_key-cert.pub:ro
     ports:
       - target: 2222
         published: 2222