Update --compose-file flag description to mention stdin

[thaJeztah]

No description provided.

[thaJeztah]

I was also looking if we could somehow include information about multiple compose files, but
wasn't sure how to best phrase (and format) that;

diff --git a/cli/command/stack/deploy.go b/cli/command/stack/deploy.go
index 6c083eb2..13e98b9d 100644
--- a/cli/command/stack/deploy.go
+++ b/cli/command/stack/deploy.go
@@ -58,7 +58,8 @@ func newDeployCommand(dockerCli command.Cli, common *commonOptions) *cobra.Comma
        flags.StringVar(&opts.Bundlefile, "bundle-file", "", "Path to a Distributed Application Bundle file")
        flags.SetAnnotation("bundle-file", "experimental", nil)
        flags.SetAnnotation("bundle-file", "swarm", nil)
-       flags.StringSliceVarP(&opts.Composefiles, "compose-file", "c", []string{}, `Path to a Compose file, or "-" to read from stdin`)
+       flags.StringSliceVarP(&opts.Composefiles, "compose-file", "c", []string{}, `Path to a Compose file, or "-" to read from stdin.
+Provide this flag multiple times to merge multiple Compose files.`)
        flags.SetAnnotation("compose-file", "version", []string{"1.25"})
        flags.BoolVar(&opts.SendRegistryAuth, "with-registry-auth", false, "Send registry authentication details to Swarm agents")
        flags.SetAnnotation("with-registry-auth", "swarm", nil)

[vdemeester]

LGTM 🐅

[codecov-io]

Codecov Report

Merging #1222 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1222      +/-   ##
==========================================
+ Coverage   54.25%   54.25%   +<.01%     
==========================================
  Files         268      268              
  Lines       17799    17796       -3     
==========================================
  Hits         9656     9656              
+ Misses       7536     7533       -3     
  Partials      607      607

[silvin-lubecki]

LGTM