git: fix: Fix continuous integration(CI) directory being included in …

…the release packages

The `git-archive-all` utility doesn't treat the `/dir/` pattern as the
same with the `git archive` command, remove the trailing slash to
workaround the problem.

Fixes #1.
Fixes #3.

Refer-to: Description - gitattributes - Git Documentation <https://www.git-scm.com/docs/gitattributes#_description>
Refer-to: Patterns in .gitattributes do not work if they end with a slash · Issue #87 · Kentzo/git-archive-all <Kentzo/git-archive-all#87>
Refer-to: Identify root cause · Task · the-common/docker-compose-config-templates <https://gitlab.com/the-common/docker-compose-config-templates/-/work_items/2>
Signed-off-by: 林博仁(Buo-ren, Lin) <Buo.Ren.Lin@gmail.com>

.gitattributes

@@ -12,7 +12,7 @@
 
 # Avoid exporting development files to release archive
 /.* export-ignore
-/continuous-integration/ export-ignore
+/continuous-integration export-ignore
 
 # Keep editorconfig for ease of editing of product files
 /.editorconfig -export-ignore