dist: Add --no-tests option

It is not always needed to test generated tarballs, for example when
they are generated by CI that already does its own testing.

docs/markdown/snippets/dist_not_tests.md

@@ -0,0 +1,5 @@
+## meson dist --no-tests
+
+`meson dist` has a new option `--no-tests` to skip build and tests of generated
+packages. It can be used to not waste time for example when done in CI that
+already does its own testing.

mesonbuild/mdist.py

@@ -39,6 +39,8 @@ def add_arguments(parser):
                         help='Comma separated list of archive types to create.')
     parser.add_argument('--include-subprojects', action='store_true',
                         help='Include source code of subprojects that have been used for the build.')
+    parser.add_argument('--no-tests', action='store_true',
+                        help='Do not build and test generated packages.')
 
 
 def create_hash(fname):
@@ -272,8 +274,10 @@ def run(options):
         return 1
     if names is None:
         return 1
-    # Check only one.
-    rc = check_dist(names[0], meson_command, extra_meson_args, bld_root, priv_dir)
+    rc = 0
+    if not options.no_tests:
+        # Check only one.
+        rc = check_dist(names[0], meson_command, extra_meson_args, bld_root, priv_dir)
     if rc == 0:
         for name in names:
             create_hash(name)