fix(executor): use ephemeral cache dir instead of volume

Switch from /data volume to /tmp/deno-cache to avoid persistent permission issues.

apps/railway-executor/Dockerfile

@@ -8,8 +8,8 @@ RUN apt-get update && apt-get install -y openssh-client && rm -rf /var/lib/apt/l
 # Set working directory
 WORKDIR /app
 
-# Set Deno cache directory to use mounted volume
-ENV DENO_DIR=/data
+# Set Deno cache directory (ephemeral, rebuilds on restart)
+ENV DENO_DIR=/tmp/deno-cache
 
 # Copy server file and startup script
 COPY server.ts .

apps/railway-executor/start.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
-# Fix permissions on the Deno cache directory (runs as root)
-mkdir -p /data
-chown -R deno:deno /data
+# Create Deno cache directory with correct permissions (runs as root)
+mkdir -p /tmp/deno-cache
+chown -R deno:deno /tmp/deno-cache
 
 # Switch to deno user and run the server
 exec su deno -c "deno run --allow-net --allow-env --allow-read --allow-write --allow-run server.ts"