Use Docker static binary instead of apt repository

Simplify Docker installation by downloading the static binary
directly. This avoids repository/OS version detection issues
and ensures we get a recent Docker client with API v1.44+.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.forgejo/workflows/docker-build.yml

@@ -16,15 +16,11 @@ jobs:
       - name: Set up Docker
         run: |
           echo "DOCKER_HOST: ${DOCKER_HOST}"
-          # Install Docker from official repository to get newer version
-          apt-get update -qq
-          apt-get install -y -qq ca-certificates curl
-          install -m 0755 -d /etc/apt/keyrings
-          curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
-          chmod a+r /etc/apt/keyrings/docker.asc
-          echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
-          apt-get update -qq
-          apt-get install -y -qq docker-ce-cli
+          # Download Docker static binary for newer API version
+          apt-get update -qq && apt-get install -y -qq curl
+          curl -fsSL https://download.docker.com/linux/static/stable/x86_64/docker-27.4.1.tgz | tar xz
+          mv docker/docker /usr/local/bin/
+          rm -rf docker
           docker version
 
       - name: Checkout repository