The .dockerignore
rules follow the filepath/#Match
.
Try (for testing) Gemfile.lock
instead of /Gemfile.lock
.
And check that the eol (end of line) characters are unix-style, not Windows style in your .dockerignore
file.
Apparently, (docker 1.10, March 2016) using rule starting with /
like /xxx
( or /.*
) is not well supported.