ci: Allow DISTROS="debian*32" variable, and KEEP=1

.ci/ci_lib.py

@@ -158,8 +158,18 @@ def make_containers():
     firstbit = lambda s: (s+'-').split('-')[0]
     secondbit = lambda s: (s+'-').split('-')[1]
 
-    return [
-        {
+    i = 1
+    lst = []
+
+    for distro in DISTROS:
+        distro, star, count = distro.rpartition('*')
+        if star:
+            count = int(count)
+        else:
+            count = 1
+
+        for x in range(count):
+            lst.append({
                 "distro": firstbit(distro),
                 "name": "target-%s-%s" % (distro, i),
                 "hostname": docker_hostname,
@@ -169,12 +179,16 @@ def make_containers():
                     if secondbit(distro) == 'py3'
                     else '/usr/bin/python'
                 )
-        }
-        for i, distro in enumerate(DISTROS, 1)
-    ]
+            })
+            i += 1
+
+    return lst
 
 
 def start_containers(containers):
+    if os.environ.get('KEEP'):
+        return
+
     run_batches([
         [
             "docker rm -f %(name)s || true" % container,