Highlight uncommitted changes in version

If there are uncommitted changes in the app repository when building,
then append `_uncommitted_<random>` to it to distinguish the image
from one built from a clean checkout.

Also change the version used when renaming a container on redeploy to
distinguish and explain the version suffixes.

lib/mrsk/cli/app.rb

@@ -21,7 +21,7 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
             execute *auditor.record("Booted app version #{version}"), verbosity: :debug
 
             if capture_with_info(*app.container_id_for_version(version), raise_on_non_zero_exit: false).present?
-              tmp_version = "#{version}_#{SecureRandom.hex(8)}"
+              tmp_version = "#{version}_replaced_#{SecureRandom.hex(8)}"
               info "Renaming container #{version} to #{tmp_version} as already deployed on #{host}"
               execute *auditor.record("Renaming container #{version} to #{tmp_version}"), verbosity: :debug
               execute *app.rename_container(version: version, new_version: tmp_version)

lib/mrsk/configuration.rb

@@ -50,7 +50,7 @@ class Mrsk::Configuration
   end
 
   def version
-    @declared_version.presence || ENV["VERSION"] || current_commit_hash
+    @declared_version.presence || ENV["VERSION"] || git_version
   end
 
   def abbreviated_version
@@ -233,10 +233,12 @@ class Mrsk::Configuration
       raw_config.servers.is_a?(Array) ? [ "web" ] : raw_config.servers.keys.sort
     end
 
-    def current_commit_hash
-      @current_commit_hash ||=
+    def git_version
+      @git_version ||=
         if system("git rev-parse")
-          `git rev-parse HEAD`.strip
+          uncommitted_suffix = `git status --porcelain`.strip.present? ? "_uncommitted_#{SecureRandom.hex(8)}" : ""
+
+          "#{`git rev-parse HEAD`.strip}#{uncommitted_suffix}"
         else
           raise "Can't use commit hash as version, no git repository found in #{Dir.pwd}"
         end