chore: attempt at making CI work

Author: Nsttt

.github/workflows/build-deploy-test.yml

@@ -232,6 +232,14 @@ jobs:
           path: scripts/tmp/build/
           retention-days: 3
 
+      - name: Upload zephyr deployment cache
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: zephyr-cache-${{ matrix.workspace }}
+          path: ~/.zephyr/
+          retention-days: 1
+
   test-deployments:
     name: Test All Deployments
     needs: [build-workspace]
@@ -242,6 +250,26 @@ jobs:
         with:
           name: workspace-files
 
+      - name: Download zephyr deployment caches
+        uses: actions/download-artifact@v4
+        with:
+          pattern: zephyr-cache-*
+          path: zephyr-caches
+          merge-multiple: false
+
+      - name: Restore zephyr cache
+        run: |
+          mkdir -p ~/.zephyr
+          if [ -d "zephyr-caches" ]; then
+            for cache_dir in zephyr-caches/zephyr-cache-*/; do
+              if [ -d "$cache_dir" ]; then
+                echo "Merging cache from $cache_dir"
+                cp -r "$cache_dir"* ~/.zephyr/ 2>/dev/null || true
+              fi
+            done
+          fi
+          echo "Total files in zephyr cache: $(ls -1 ~/.zephyr/ 2>/dev/null | wc -l)"
+
       - uses: pnpm/action-setup@v4
         with:
           version: 10.6.3