Fix port collision bug, add --container-port flag

Port allocation:
- Use atomic flock-based allocation via /etc/ship/next_port
- Prevents race conditions when multiple deploys run concurrently
- Each app still gets its port stored in /etc/ship/ports/<name>

Docker container port:
- Add --container-port flag (default 80)
- Template now uses {{.ContainerPort}} instead of hardcoded 80
- Supports containers that listen on 8080, 3000, etc.

1 files changed, 2 insertions, 0 deletions

diff --git a/cmd/ship/root_v2.go b/cmd/ship/root_v2.go
index 4101d4e..aa81d1e 100644
--- a/cmd/ship/root_v2.go
+++ b/cmd/ship/root_v2.go
@@ -43,6 +43,7 @@ func initV2() {
         rootV2Cmd.Flags().String("ttl", "", "Auto-delete after duration (e.g., 1h, 7d)")
         rootV2Cmd.Flags().StringArray("env", nil, "Environment variable (KEY=VALUE)")
         rootV2Cmd.Flags().String("env-file", "", "Path to .env file")
+        rootV2Cmd.Flags().Int("container-port", 80, "Port the container listens on (Docker only)")
 
         // Check for SHIP_PRETTY env var
         if os.Getenv("SHIP_PRETTY") == "1" {
@@ -78,6 +79,7 @@ func runDeployV2(cmd *cobra.Command, args []string) error {
         opts.TTL, _ = cmd.Flags().GetString("ttl")
         opts.Env, _ = cmd.Flags().GetStringArray("env")
         opts.EnvFile, _ = cmd.Flags().GetString("env-file")
+        opts.ContainerPort, _ = cmd.Flags().GetInt("container-port")
 
         // deployV2 handles all output and exits
         deployV2(path, opts)