Remove custom MIOpen cache path — let MIOpen use its defaults

The named volume overlay was causing SQLite 'unable to open database file'
crashes. MIOpen's default cache location (~/.config/miopen) works reliably
inside the container. The startup warmup repopulates it each run.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -22,22 +22,11 @@ services:
       - ./voices:/app/voices
       - ./reference_audio:/app/reference_audio
       - hf_cache:/app/hf_cache
-      - miopen_cache:/app/miopen_cache
     environment:
       - HF_HUB_ENABLE_HF_TRANSFER=1
-      # Disable MIOpen's GEMM convolution solver. PyTorch passes a null workspace
-      # pointer (ptr=0, size=0) which causes GemmFwdRest to warn and fall back on
-      # every conv op. Disabling it makes MIOpen go straight to Direct/Winograd
-      # solvers that don't require workspace allocation.
-      - MIOPEN_DEBUG_CONV_GEMM=0
-      # Persist MIOpen's kernel cache so it doesn't recompile on every start.
-      - MIOPEN_USER_DB_PATH=/app/miopen_cache
-      - MIOPEN_CUSTOM_CACHE_DIR=/app/miopen_cache
       # Required for RX 6700 XT (gfx1031) - not natively supported in ROCm 7.2.
-      # Without this the GPU runs in software emulation and synthesis takes 40+ seconds.
       - HSA_OVERRIDE_GFX_VERSION=10.3.0
       # - HF_TOKEN=your_token_here
 
 volumes:
   hf_cache:
-  miopen_cache: