Closes #186 and fixes an issue with docker-compose

CTFd/__init__.py

@@ -40,6 +40,8 @@ def create_app(config='CTFd.config'):
             db.create_all()
         except OperationalError:
             db.create_all()
+        except ProgrammingError:  ## Database already exists
+            pass
         else:
             db.create_all()
 

CTFd/admin.py

@@ -274,7 +274,7 @@ def delete_container(container_id):
 @admins_only
 def new_container():
     name = request.form.get('name')
-    if set(name) <= set('abcdefghijklmnopqrstuvwxyz0123456789-_'):
+    if not set(name) <= set('abcdefghijklmnopqrstuvwxyz0123456789-_'):
         return redirect(url_for('admin.list_container'))
     buildfile = request.form.get('buildfile')
     files = request.files.getlist('files[]')