Place license boilerplate in Containerfile

As suggested by the documentation: https://www.apache.org/licenses/LICENSE-2.0#apply

Containerfile

@@ -1,5 +1,17 @@
-# Copyright 2023 Foster Hangdaan <foster@hangdaan.email>
+# Copyright 2023 Foster Hangdaan
-# Licensed under Apache-2.0
+#
+# Licensed 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.
+
 
 # Download, verify and unpack stage
 FROM docker.io/library/debian:12 as downloader

README.org

@@ -79,17 +79,7 @@ Refer to [[https://git-send-email.io][this guide]] if you are not familiar with
 
 * License
 
-Licensed under the Apache License, Version 2.0 (the "License");
+Licensed under the Apache License, Version 2.0. See =LICENSE.txt=.
-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.
 
 * Copyright