Sample dockerignore for a Rails app

.dockerignore

.git
.gitignore
README.md

#
# OS X
#
.DS_Store
.AppleDouble
.LSOverride
# Icon must end with two \r
Icon
# Thumbnails
._*
# Files that might appear on external disk
.Spotlight-V100
.Trashes
# Directories potentially created on remote AFP share
.AppleDB
.AppleDesktop
Network Trash Folder
Temporary Items
.apdisk

#
# Rails
#
.env
.env.sample
*.rbc
capybara-*.html
log
tmp
db/*.sqlite3
db/*.sqlite3-journal
public/system
coverage/
spec/tmp
**.orig

.bundle

.ruby-version
.ruby-gemset

.rvmrc

# if using bower-rails ignore default bower_components path bower.json files
vendor/assets/bower_components
*.bowerrc
bower.json

how about config/database.yml ? and config/secrets.yml ?
Sorry fo the silly question :)

I thought when we ignore the files then we can copied later.