chore: update E2E tests workflow to capture logs on cancellation and add shared volume for backend services

.github/workflows/e2e-tests.yml

@@ -130,7 +130,7 @@ jobs:
 
       # ─── Failure diagnostics ───────────────────────────────────────────
       - name: Dump backend stack logs on failure
-        if: failure()
+        if: ${{ failure() || cancelled() }}
         run: |
           mkdir -p ./compose-logs
           docker compose -f docker/docker-compose.e2e.yml logs --no-color --timestamps \
@@ -160,7 +160,7 @@ jobs:
           retention-days: 14
 
       - name: Upload backend stack logs
-        if: failure()
+        if: ${{ failure() || cancelled() }}
         uses: actions/upload-artifact@v7
         with:
           name: backend-stack-logs

docker/docker-compose.e2e.yml

@@ -109,6 +109,8 @@ services:
     environment:
       <<: *backend-env
       SERVICE_ROLE: api
+    volumes:
+      - shared_temp:/shared_tmp
     extra_hosts:
       - "host.docker.internal:host-gateway"
     ports:
@@ -147,6 +149,8 @@ services:
     environment:
       <<: *backend-env
       SERVICE_ROLE: worker
+    volumes:
+      - shared_temp:/shared_tmp
     depends_on:
       backend: { condition: service_healthy }
     healthcheck:
@@ -172,3 +176,6 @@ networks:
   # redis stay off this network entirely.
   ingress:
     driver: bridge
+
+volumes:
+  shared_temp: