Add docker entrypoint and env loader

kngil/bbs/env.php

@@ -0,0 +1,59 @@
+<?php
+// .env 파일을 한 번만 읽어 환경변수로 주입합니다.
+function kngil_load_env_once(string $path): void
+{
+    static $loaded = false;
+    if ($loaded) {
+        return;
+    }
+
+    $loaded = true;
+
+    if (!is_file($path) || !is_readable($path)) {
+        return;
+    }
+
+    $lines = file($path, FILE_IGNORE_NEW_LINES);
+    if ($lines === false) {
+        return;
+    }
+
+    foreach ($lines as $line) {
+        $line = trim($line);
+        if ($line === '' || str_starts_with($line, '#')) {
+            continue;
+        }
+
+        if (str_starts_with($line, 'export ')) {
+            $line = substr($line, 7);
+        }
+
+        $pos = strpos($line, '=');
+        if ($pos === false) {
+            continue;
+        }
+
+        $name = trim(substr($line, 0, $pos));
+        $value = trim(substr($line, $pos + 1));
+
+        if ($name === '') {
+            continue;
+        }
+
+        if (
+            (str_starts_with($value, '"') && str_ends_with($value, '"')) ||
+            (str_starts_with($value, "'") && str_ends_with($value, "'"))
+        ) {
+            $value = substr($value, 1, -1);
+        }
+
+        $current = getenv($name);
+        if ($current !== false && $current !== '') {
+            continue;
+        }
+
+        putenv($name . '=' . $value);
+        $_ENV[$name] = $value;
+        $_SERVER[$name] = $value;
+    }
+}