fix: restore HOST override in zsh workspace services

Coolify injects HOST=0.0.0.0 and zsh's prompt reads $HOST instead of the
real hostname, so hostname: alone shows user@0. Set HOST=${SERVICE_HOSTNAME}
again in code-server, code-server-lsio and paseo.

code-server-lsio/.env.example

@@ -2,7 +2,7 @@
 #
 #   cp .env.example .env
 
-# Container hostname.
+# Container hostname, also passed in as HOST -- the name zsh's prompt shows.
 SERVICE_HOSTNAME=code-server-lsio
 
 # Web UI login password. Required.

code-server-lsio/README.md

@@ -32,7 +32,7 @@ separate rootless daemon.
 
 | Variable | Purpose |
 | --- | --- |
-| `SERVICE_HOSTNAME` | Container hostname. |
+| `SERVICE_HOSTNAME` | Container hostname, and the name the shell prompt shows. |
 | `PASSWORD` | Web UI login, also the in-container sudo password. Required. |
 | `GIT_NAME` / `GIT_EMAIL` | Git author and committer identity |
 | `PWA_APPNAME` | Optional. Name of the installed web app; defaults to `code-server`. |
@@ -43,6 +43,14 @@ The compose file refuses to start when `PASSWORD` is unset or blank. The image
 itself would start anyway and serve code-server with no authentication, on a
 container that holds the Docker socket.
 
+`SERVICE_HOSTNAME` is used twice: as the container's `hostname:` and as the
+`HOST` variable inside it. Coolify injects `HOST=0.0.0.0` into every compose
+app, and zsh seeds `$HOST` and the `%m`/`%M` prompt escapes from that variable
+rather than calling `gethostname()` — so the prompt reads `0`, the first
+dot-separated field of `0.0.0.0`. code-server itself never reads `HOST` — it
+binds `[::]:8443` — so overriding it only affects the prompt. bash is
+unaffected; its `\h` uses the real hostname.
+
 `PUID`/`PGID` are pinned to `1000` in `compose.yml`; the `Dockerfile` depends
 on that (see [Storage](#storage)).
 

code-server-lsio/compose.yml

@@ -17,6 +17,7 @@ services:
       - GIT_AUTHOR_EMAIL=${GIT_EMAIL}
       - GIT_COMMITTER_NAME=${GIT_NAME}
       - GIT_COMMITTER_EMAIL=${GIT_EMAIL}
+      - HOST=${SERVICE_HOSTNAME}
       # - PWA_APPNAME=${PWA_APPNAME:-code-server}
     volumes:
       - 'code-server-config:/config'