chore: add hack/gen-containerd-hosts.sh (#1361)

Signed-off-by: Jim Ma <majinjing3@gmail.com>

hack/gen-containerd-hosts.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# the register to pull image, like "docker.io", when pull image with "docker.io/library/alpine:latest"
+registry=${1:-${REGISTRY}}
+
+# the real server which serves image pulling, like "registry-1.docker.io"
+# in normal case, registry_server is same with registry
+registry_server=${REGISTRY_SERVER:-${registry}}
+
+# dragonfly proxy url
+d7y_proxy=${2:-http://127.0.0.1:65001}
+
+if [[ -z "${registry}" ]]; then
+    echo empty registry domain
+    exit 1
+fi
+
+conf_dir=${CONTAINED_CONFIG_DIR:-/etc/containerd/certs.d}
+
+mkdir -p "$conf_dir/${registry}"
+
+cat << EOF > "$conf_dir/${registry}"/hosts.toml
+server = "https://${registry_server}"
+
+[host."${d7y_proxy}"]
+  capabilities = ["pull", "resolve"]
+  [host."${d7y_proxy}".header]
+    X-Dragonfly-Registry = ["https://${registry_server}"]
+EOF