ci: adopt reusable workflows from `named-data/actions`

Switch source archive (tarball) to xz compression and
mention using gerrit for code review in the README

Change-Id: Ie69de065311737f6fe48976fbab5f896f3960e06
diff --git a/wscript b/wscript
index 59bb70f..d5e2b20 100644
--- a/wscript
+++ b/wscript
@@ -197,7 +197,9 @@
         Logs.warn('%s is not writable (%s)' % (versionFile, e.strerror))
 
 def dist(ctx):
+    ctx.algo = 'tar.xz'
     version(ctx)
 
 def distcheck(ctx):
+    ctx.algo = 'tar.xz'
     version(ctx)