ci: initialize isolated Buildah auth files [CI]

ci/build-dev-image.sh

@@ -84,6 +84,11 @@ base_home="/home/justme/woodpecker/buildah-home/dev-image-build-noble-aot-v1-$co
 # 镜像标签不带 v（和正式版一致）：latest 和 <版本>；构建信息和清单里的 tag 带 v
 image_version="$MOSHIRO_VERSION"
 mkdir -p "$work" "$base_home"
+export REGISTRY_AUTH_FILE="$work/$component-auth.json"
+if [[ ! -s "$REGISTRY_AUTH_FILE" ]]; then
+  printf '{"auths":{}}\n' > "$REGISTRY_AUTH_FILE"
+  chmod 600 "$REGISTRY_AUTH_FILE"
+fi
 
 if [[ "$component" == backend ]]; then
   BUILDAH_HOME="$base_home" \
@@ -99,7 +104,6 @@ export HOME="$base_home"
 export BUILDAH_HOME="$base_home"
 source "$root/ci/buildah-env.sh"
 moshiro_setup_buildah "$base_home"
-export REGISTRY_AUTH_FILE="$work/$component-auth.json"
 context="$work/$component"
 local_image="localhost/moshiro-$component:dev-$arch-check"
 node_rid="linux-musl-x64"