Fix CI image generate workflow to use uv

.github/workflows/make-images.yml

@@ -13,19 +13,19 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
+    # Use "uv" for python and dependency management
+    - uses: astral-sh/setup-uv@v2
+      with:
+        enable-cache: true
     - name: Install dependencies
-      run: |
-        python --version
-        python -m pip install --upgrade pip
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-
+      run: uv sync
     - name: Generate graphs
       run: |
-        python prune-cache.py --inplace --days 90 # Re-fetch most recent 90 days, in case of reanalysis
-        python sea-surface-temps.py --mode graph --dataset sst --out sst-all.png
-        python sea-surface-temps.py --mode graph --dataset anom --out sst-all-anom.png
-        python sea-surface-temps.py --mode graph --dataset sst --out sst-all.svg
-        python sea-surface-temps.py --mode graph --dataset anom --out sst-all-anom.svg
+        uv run prune-cache.py --inplace --days 90 # Re-fetch most recent 90 days, in case of reanalysis
+        uv run sea-surface-temps.py --mode graph --dataset sst --out sst-all.png
+        uv run sea-surface-temps.py --mode graph --dataset anom --out sst-all-anom.png
+        uv run sea-surface-temps.py --mode graph --dataset sst --out sst-all.svg
+        uv run sea-surface-temps.py --mode graph --dataset anom --out sst-all-anom.svg
 
     # Maps: OK if these fail; we're looking for yesterday, might not be there yet.
     - name: Generate maps