fix(ci): install docker client on node runner

- runs-on: node (node:22-bookworm doesn't have docker by default)
- Add step to install docker.io before build
- Fixes: 'docker: command not found' error

.gitea/workflows/build-push.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   build-push:
-    runs-on: node,docker
+    runs-on: node
     env:
       REGISTRY: forgejo.riotpiao.com
       IMAGE: forgejo.riotpiao.com/rock/portfolio
@@ -15,6 +15,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Install Docker client
+        run: |
+          apt-get update
+          apt-get install -y docker.io
+
       - name: Get short SHA
         id: sha
         run: |