🐛 Fix dead accumulator, multi-arg exec drop, and init placeholder 🐛

set -e in go-workflow made the retVal/GO_EXITCODE accumulator dead code —
any failing run_step call exits the script immediately via set -e before
retVal=$? is ever reached, so GO_EXITCODE only ever sums zeros.
Remove the accumulator and simplify run_step; set -e already propagates
failures naturally.
__exec_command in the *) and exec) cases only used the first element of its
arg array (local cmdExec="${arg:-}" expands to arg[0]), silently dropping
every subsequent word. "docker run casjaysdev/go go test ./..." ran just
"go" with no subcommand. Replace __exec_command with exec "$@" directly in
both cases; exec is correct (no extra process) and preserves all args.
00-go.sh exported CONTAINER_INIT and SERVICE_USES_PID inside a subshell
( source "$init" ) — those exports never propagated back to the parent
entrypoint. Move SERVICE_USES_PID="no" to go.sh (sourced by the parent
shell before __start_init_scripts runs) so the framework takes the explicit
"config service, no PID" path. Rewrite 00-go.sh as a documented placeholder
explaining why the file must still exist (init_count == 0 triggers an
infinite background keep-alive loop).
- rootfs/usr/local/bin/go-workflow: remove GO_EXITCODE/retVal accumulator;
simplify run_step to drop exitCode capture (always 0 with set -e)
- rootfs/usr/local/bin/entrypoint.sh: *) case uses exec "$@" / exec go-workflow;
exec) case uses exec "$@" with proper empty-arg error instead of broken
__exec_command fallback
- rootfs/usr/local/etc/docker/env/go.sh: add SERVICE_USES_PID="no"
- rootfs/usr/local/etc/docker/init.d/00-go.sh: remove dead exports; add
comment explaining placeholder purpose

rootfs/usr/local/bin/entrypoint.sh
rootfs/usr/local/bin/go-workflow
rootfs/usr/local/etc/docker/env/go.sh
rootfs/usr/local/etc/docker/init.d/00-go.sh

rootfs/usr/local/bin/entrypoint.sh

@@ -655,8 +655,11 @@ procs)
 # execute commands
 exec)
   shift 1
-  __exec_command "${@:-echo "No commands given"}"
-  exit $?
+  if [ $# -eq 0 ]; then
+    echo "Error: exec requires a command" >&2
+    exit 1
+  fi
+  exec "$@"
   ;;
 # show/start init scripts
 start)
@@ -682,11 +685,10 @@ start)
 *)
   if [ $# -eq 0 ]; then
     # No args: run the default Go workflow (tidy → fmt → vet → test → build)
-    __exec_command go-workflow
+    exec go-workflow
   else
-    __exec_command "$@"
+    exec "$@"
   fi
-  exit $?
   ;;
 esac
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