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, 9 insertions, 8 deletions

diff --git a/cmd/ship/deploy_v2.go b/cmd/ship/deploy_v2.go
index b636709..7d498b2 100644
--- a/cmd/ship/deploy_v2.go
+++ b/cmd/ship/deploy_v2.go
@@ -143,14 +143,15 @@ func deployV2(path string, opts deployV2Options) {
 }
 
 type deployV2Options struct {
-        Name    string
-        Host    string
-        Domain  string
-        Health  string
-        TTL     string
-        Env     []string
-        EnvFile string
-        Pretty  bool
+        Name          string
+        Host          string
+        Domain        string
+        Health        string
+        TTL           string
+        Env           []string
+        EnvFile       string
+        ContainerPort int // Port the container listens on (default 80 for Docker)
+        Pretty        bool
 }
 
 // deployContext holds all info needed for a deploy