refactor: update the COPY command in the Dockerfile to copy the destination directory to './' instead of '.'

[imoken777]

Types of changes

What kind of change does this PR introduce? (check at least one)

• Breaking change
• Bugfix
• Feature
• Code style update
• Refactoring
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Description

DockerfileのCOPYコマンドのディレクトリ指定は末尾が/で終わっていなければならないため以下を修正

catapult/Dockerfile

Line 5 in 52eeb89

COPY package.json package-lock.json .

表示されていたエラー

When using COPY with more than one source file, the destination must be a directory and end with a / or a \dockerfile-utils(23)

参照: docker公式ドキュメントよりhttps://docs.docker.com/reference/dockerfile/#copy

If multiple resources are specified, either directly or due to the use of a wildcard, then must be a directory, and it must end with a slash ./

[solufa]

これは知らなかった、LGTM