♻️ refactor(runner): simplify shell helpers and workflow scripts

docker-runner/common/entrypoint.sh

@@ -20,6 +20,24 @@ mkdir -p "$PERSISTENT_BIN"
 mkdir -p /var/log/supervisor
 mkdir -p /var/run
 
+create_buildx_builder() {
+    docker buildx create \
+        --name gitea-multiarch \
+        --driver docker-container \
+        --bootstrap \
+        --use \
+        --config /data/buildx/buildkitd.toml 2>/dev/null || \
+    docker buildx use gitea-multiarch 2>/dev/null
+}
+
+ensure_buildx_builder() {
+    docker buildx use gitea-multiarch 2>/dev/null || {
+        echo "⚠ Recreating Buildx builder..."
+        docker buildx rm gitea-multiarch 2>/dev/null || true
+        create_buildx_builder
+    }
+}
+
 # ============================================
 # 初始化 Docker Buildx 支持（可选）
 # ============================================
@@ -104,13 +122,7 @@ if [ "$ENABLE_BUILDX" = "true" ]; then
 EOF
 
         # 创建 Buildx builder
-        docker buildx create \
-            --name gitea-multiarch \
-            --driver docker-container \
-            --bootstrap \
-            --use \
-            --config /data/buildx/buildkitd.toml 2>/dev/null || \
-        docker buildx use gitea-multiarch 2>/dev/null
+        create_buildx_builder
 
         # 验证
         echo "Verifying Buildx..."
@@ -125,15 +137,7 @@ EOF
         echo "✓ Buildx already configured"
 
         # 确保 builder 可用
-        docker buildx use gitea-multiarch 2>/dev/null || {
-            echo "⚠ Recreating Buildx builder..."
-            docker buildx rm gitea-multiarch 2>/dev/null || true
-            docker buildx create \
-                --name gitea-multiarch \
-                --driver docker-container \
-                --bootstrap \
-                --use 2>/dev/null
-        }
+        ensure_buildx_builder
     fi
 
     echo ""