Server: add docker-buildx-plugin package to main workflow

.github/workflows/github-actions-main.yml

@@ -165,7 +165,7 @@ jobs:
               "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
               $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
           sudo apt-get update || true
-          sudo apt-get install -y docker-ce docker-ce-cli containerd.io
+          sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin
 
       - uses: actions/checkout@v4