Introduce MPL in place of AGPL (#518)

## What is the goal of this PR?

We introduce the Mozilla Public License (2.0) to replace all usages of
the AGPL license. This is reflected in all license checkstyle rules. We
also adopt the MPL license for files in this repository, adding them
where necessary and introducing missing `checkstyle` tests.

## What are the changes implemented in this PR?

- Update the checkstyle rules to handle MPL instead of AGPL.
- Update licenses in this repository to use MPL throughout.
- Add missing checkstyle tests and correct licenses throughout this
repository.

.bazelignore

@@ -1 +1,5 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
 tool/ide/test

.bazelrc

@@ -1,3 +1,7 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
 build --incompatible_strict_action_env
 run --incompatible_strict_action_env
 test --incompatible_strict_action_env

.factory/automation.yml

@@ -1,28 +1,14 @@
-#
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-#   http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-# KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 build:
   correctness:
     build:
       image: vaticle-ubuntu-22.04
       command: |
         bazel build //...
+        bazel test $(bazel query 'kind(checkstyle_test, //... except tool/ide/...)') || exit 1
     rust-ide-sync:
       image: vaticle-ubuntu-22.04
       command: |

.gitattributes

@@ -1,19 +1,7 @@
-#
-# Copyright (C) 2022 Vaticle
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as
-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
 
 *.bat   text eol=crlf
 

.gitignore

@@ -1,3 +1,8 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+
 .DS_Store
 *.iml
 .ijwb/

BUILD

@@ -1,16 +1,20 @@
-#
-# Copyright (C) 2022 Vaticle
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as
-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+load("//tool/checkstyle:rules.bzl", "checkstyle_test")
+
+checkstyle_test(
+    name = "checkstyle",
+    include = glob(["*", ".factory/*"]),
+    exclude = glob([
+        "*.md",
+    ]) + [
+        ".bazelversion",
+        ".bazel-remote-cache.rc",
+        ".bazel-cache-credential.json",
+        "LICENSE",
+    ],
+    license_type = "mpl-header",
+    size = "small",
+)