Omni/Deploy: add WorkingDirectory support and rename to deployer

- Add execWorkingDirectory field to Exec type in Manifest.hs
- Generate WorkingDirectory= in systemd unit files
- Allow add-service to update existing services
- Rename biz-deployer to deployer throughout
- Fix Caddy.hs and Systemd.hs tests for new Exec constructor

This fixes subagent stalls caused by Coder running direnv from wrong directory.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/Omni/Deploy/Systemd.hs b/Omni/Deploy/Systemd.hs
index b47776a..8c6d416 100644
--- a/Omni/Deploy/Systemd.hs
+++ b/Omni/Deploy/Systemd.hs
@@ -31,7 +31,7 @@ import System.FilePath ((</>))
 import qualified System.Process as Process
 
 servicesDir :: FilePath
-servicesDir = "/var/lib/biz-deployer/services"
+servicesDir = "/var/lib/deployer/services"
 
 generateUnit :: Service -> Text
 generateUnit Service {..} =
@@ -60,9 +60,14 @@ generateUnit Service {..} =
         "Restart=" <> systemdRestart serviceSystemd,
         "RestartSec=" <> tshow (systemdRestartSec serviceSystemd)
       ]
+        ++ workingDirLine
         ++ envLines
         ++ envFileLine
 
+    workingDirLine = case execWorkingDirectory serviceExec of
+      Nothing -> []
+      Just dir -> ["WorkingDirectory=" <> dir]
+
     envLines =
       Map.toList serviceEnv
         |> map (\(k, v) -> "Environment=\"" <> k <> "=" <> v <> "\"")
@@ -193,7 +198,7 @@ mkTestService name path =
     { serviceName = name,
       serviceArtifact = Artifact "nix-closure" path,
       serviceHosts = ["biz"],
-      serviceExec = Exec Nothing "root" "root",
+      serviceExec = Exec Nothing "root" "root" Nothing,
       serviceEnv = mempty,
       serviceEnvFile = Nothing,
       serviceHttp = Nothing,
@@ -230,7 +235,7 @@ test_generateUnitWithCustomExec =
   Test.unit "generates unit with custom exec" <| do
     let svc =
           (mkTestService "custom-exec" "/nix/store/abc")
-            { serviceExec = Exec (Just "my-binary") "www-data" "www-data"
+            { serviceExec = Exec (Just "my-binary") "www-data" "www-data" Nothing
             }
         unit = generateUnit svc
     Text.isInfixOf "ExecStart=/nix/store/abc/bin/my-binary" unit Test.@=? True