skip the isntalation of bun if already on the system

.gitea/workflows/test.yaml

@@ -6,7 +6,7 @@ jobs:
     container:
       image: docker:dind
       volumes:
-        - /root/.npm:/root/.npm
+        - /root:/root
         - /var/lib/docker/image:/var/lib/docker/image
         - /var/lib/docker/overlay2:/var/lib/docker/overlay2
     steps:
@@ -17,8 +17,9 @@ jobs:
       - name: Check out repository code
         uses: actions/checkout@v3
       - name: Install bun.sh 
+        if: ${{ hashFiles('~/.bun/bin/bun') == '' }}
         run: curl https://raw.githubusercontent.com/LowByteFox/bun-musl/main/bun-musl -o bun-musl && bash bun-musl install
       - name: Install project dependencies
-        run: ~/.bun/bin/bun install
+        run: ~/.bun/bin/bun i
       - name: Run docker-compose
         run: docker compose down -v && docker compose run bot-api bun test