[v1.9.x] Fix CD for pypi wheel version (apache#20782)

* Change env variable used to detect whether it's a release build or not. RELEASE_BUILD is already setup in the CD pipeline.

* Refine how variable is compared to trigger release builds.

* Check for 'true' exclusively, to prevent unwanted release builds.

* Make sure we pass any environment variables on the build.py command line to the docker run command.

ci/build.py

@@ -273,15 +273,10 @@ def container_run(platform: str,
         # mount mxnet/build for storing build
         '-v', "{}:/work/build".format(local_build_folder),
         '-v', "{}:/work/ccache".format(local_ccache_dir),
-        '-u', '{}:{}'.format(os.getuid(), os.getgid()),
-        '-e', 'CCACHE_MAXSIZE={}'.format(environment['CCACHE_MAXSIZE']),
-        # temp dir should be local and not shared
-        '-e', 'CCACHE_TEMPDIR={}'.format(environment['CCACHE_TEMPDIR']),
-        # this path is inside the container as /work/ccache is mounted
-        '-e', "CCACHE_DIR={}".format(environment['CCACHE_DIR']),
-        # a container-scoped log, useful for ccache verification.
-        '-e', "CCACHE_LOGFILE={}".format(environment['CCACHE_LOGFILE']),
+        '-u', '{}:{}'.format(os.getuid(), os.getgid())
     ]
+    for e in environment.keys():
+        docker_arg_list += ['-e', '{}={}'.format(e, environment[e])]
     docker_arg_list += [tag]
     docker_arg_list.extend(command)
 

tools/pip/setup.py

@@ -45,7 +45,7 @@
 __version__ = libinfo['__version__']
 
 # set by the CD pipeline
-is_release = os.environ.get("IS_RELEASE", "").strip()
+is_release = (os.environ.get("RELEASE_BUILD", "false").strip().lower() == "true")
 
 # set by the travis build pipeline
 travis_tag = os.environ.get("TRAVIS_TAG", "").strip()