refactor(postgres-dump): 简化 Docker 执行逻辑并移除冗余代码

docker-exec-via-sock.sh

@@ -59,9 +59,10 @@ docker_exec_create() {
     AttachStdout: true,
     AttachStderr: true,
     Tty: true,
-    Cmd: ["bash", "-lc", $cmd]
+    Cmd: ["sh", "-c", $cmd]
   }')
 
+  DOCKER_LAST_RESPONSE=""
   DOCKER_LAST_RESPONSE=$(curl --fail --silent --show-error --unix-socket "$DOCKER_SOCKET" \
     -X POST \
     -H "Content-Type: application/json" \
@@ -83,6 +84,7 @@ docker_exec_start() {
   docker_exec_start_id=$1
   docker_exec_start_desc=$2
   docker_exec_start_endpoint="${docker_api_base}/exec/${docker_exec_start_id}/start"
+  DOCKER_LAST_RESPONSE=""
   DOCKER_LAST_RESPONSE=$(curl --fail --show-error --silent --unix-socket "$DOCKER_SOCKET" \
     -X POST \
     -H "Content-Type: application/json" \
@@ -97,6 +99,7 @@ docker_exec_start() {
 docker_exec_exit_code() {
   docker_exec_exit_id=$1
   docker_exec_inspect_endpoint="${docker_api_base}/exec/${docker_exec_exit_id}/json"
+  DOCKER_LAST_RESPONSE=""
   DOCKER_LAST_RESPONSE=$(curl --fail --silent --show-error --unix-socket "$DOCKER_SOCKET" "$docker_exec_inspect_endpoint")
   docker_exec_exit_code_value=$(printf '%s' "$DOCKER_LAST_RESPONSE" | jq -r '.ExitCode // empty')