refactor(docker): remove unnecessary tmpfs mounts

Removed both tmpfs mounts (/home/foundry/.foundry and /var/log) as they
are not needed with --prune-history flag.

Analysis:
- With --prune-history, Anvil keeps state in process memory only (~58MB)
- No state files written to disk (verified 0 files after 60s runtime)
- Container writable layer stays at 4.1kB (no growth)
- tmpfs was reserving 16GB of RAM for 0% usage

The --prune-history flag IS the real fix for disk accumulation, not tmpfs.

Kept the necessary protections:
- Logging limits (prevents Docker JSON log accumulation)
- Prometheus retention limits (prevents unbounded metrics growth)
- Anonymous volume for Rust artifacts (prevents 32GB host accumulation)

Result: Same protection against disk accumulation, but without
unnecessarily reserving 16GB of RAM.

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

Author: Luiz Gustavo Abou Hatem de Liz

README.md

@@ -92,9 +92,10 @@ The Docker environment is optimized to prevent excessive disk usage, but monitor
 
 ### Built-in Protections
 
-- **Chain container (Anvil)**: Uses tmpfs (in-memory storage) with 2GB limit
+- **Chain container (Anvil)**: Uses `--prune-history` flag to keep state in process memory only (no disk accumulation)
 - **Container logs**: Limited to 10MB per file, max 3 files (30MB total per service)
 - **Prometheus data**: Retention limited to 7 days and 1GB
+- **Rust build artifacts**: Stored in Docker volumes (not on host disk)
 
 ### Monitoring Disk Usage
 

docker-compose.yml

@@ -18,13 +18,8 @@ services:
       - ETH_BLOCKNUMBER=${ETH_BLOCKNUMBER:-}
     volumes:
       - ./docker/anvil-entrypoint.sh:/entrypoint.sh:ro
-    # Use tmpfs for Anvil state (in-memory, auto-cleanup, prevents disk accumulation)
-    # Anvil stores state in /home/foundry/.foundry/anvil/tmp/
-    # Size increased to 16GB to accommodate state accumulation during long runs
-    # Adjust based on your test duration and available RAM
-    tmpfs:
-      - /home/foundry/.foundry:size=16G,mode=1777
-      - /var/log:size=50m,mode=1777
+    # Note: tmpfs NOT needed - Anvil with --prune-history keeps state in process memory only
+    # No disk/tmpfs accumulation occurs (verified 0% usage)
     ports:
       - "8545:8545"
     dns: