borg container image feature/review-docker: pipelines and scripts revisions (#1)

Co-authored-by: Márcio Fernandes <marcio.fernandes@outlook.pt>
Reviewed-on: #1

docker/app/README.md

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+# borg backup helper
+
+for mode SCRIPT, file /app/backup-scripts/backup must be created.
+
+- Docker Compose Configs Sections (check repo <https:///git.limbosolutions.com/kb/borg> readme file for more information);
+- binding mounts (Ex: ./backup-scripts:/app/backup-scripts);
+- kubernetes secrets, configSections or even volumes;
+  
+The file backup will be automatically executed if exists.