add blogpost and cdn chall

services/blogpost/chall/init_db.sql

@@ -0,0 +1,18 @@
+PRAGMA foreign_keys = ON;
+
+CREATE TABLE users (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  username TEXT UNIQUE NOT NULL,
+  password TEXT NOT NULL,
+  role TEXT NOT NULL DEFAULT 'user'
+);
+
+CREATE TABLE posts (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  title TEXT,
+  content TEXT,
+  image_filename TEXT,
+  metadata TEXT,
+  author_id INTEGER,
+  FOREIGN KEY(author_id) REFERENCES users(id)
+);