fix(ci): clean up leftover mongo-ci container before starting

Previous run's container persisted across CI runs (runner shares the
host Docker daemon), so 'docker run --name mongo-ci' hit a name
conflict. 'docker rm -f mongo-ci || true' at the start of the step
makes it idempotent.

.forgejo/workflows/test.yml

@@ -40,6 +40,7 @@ jobs:
       - run: npx playwright install --with-deps chromium
       - name: Start MongoDB
         run: |
+          docker rm -f mongo-ci 2>/dev/null || true
           docker run -d --name mongo-ci --network host mongo:7
           docker ps
       - name: Wait for MongoDB
@@ -102,6 +103,7 @@ jobs:
       - run: npx playwright install --with-deps chromium
       - name: Start MongoDB
         run: |
+          docker rm -f mongo-ci 2>/dev/null || true
           docker run -d --name mongo-ci --network host mongo:7
           docker ps
       - name: Wait for MongoDB