fix(deploy): CPU-only torch to fit Fly 8GB image limit; longer wait; no dup volumes

- CUDA torch wheels made the image exceed Fly's 8GB uncompressed rootfs
  limit ('Not enough space to unpack image'); install CPU wheels instead
- --wait-timeout 600 for the 3.5GB image pull on first boot
- only create the volume if none exists (previous runs created duplicates)

Author: Goldokpa

.github/workflows/deploy.yml

@@ -34,13 +34,16 @@ jobs:
           FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
         run: |
           flyctl apps create climatevision-green || echo "App already exists (or create skipped)."
-          flyctl volumes create climatevision_data --app climatevision-green \
-            --region lhr --size 1 --yes || echo "Volume already exists (or create skipped)."
+          if ! flyctl volumes list --app climatevision-green | grep -q climatevision_data; then
+            flyctl volumes create climatevision_data --app climatevision-green --region lhr --size 1 --yes
+          else
+            echo "Volume already exists."
+          fi
 
       - name: Deploy to Fly.io
         env:
           FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
-        run: flyctl deploy --remote-only --ha=false
+        run: flyctl deploy --remote-only --ha=false --wait-timeout 600
 
       - name: Show status
         env:

Dockerfile

@@ -40,6 +40,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 # Install Python dependencies
 COPY requirements.txt ./
+# Install CPU-only PyTorch first: the default CUDA wheels unpack to >8GB,
+# exceeding Fly.io's maximum uncompressed image size. The Fly VM has no GPU.
+RUN pip install --no-cache-dir torch torchvision --index-url https://download.pytorch.org/whl/cpu
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Install the ClimateVision package