Don't include disabled apks in the index

This needs a rerun of `fdroid update --clean`.

In case a build is disabled delete_disabled_builds takes care of
deleting it from the repo. But this only works if the apk follows the
normal name pattern. Otherwise it will stay in the folder and be picked
up by process_apks and added to the index.

Closes: #1002

tests/update.TestCase

@@ -1716,6 +1716,38 @@ class UpdateTest(unittest.TestCase):
             self.maxDiff = None
             self.assertEqual(apkaapt, apkandroguard)
 
+    def test_exclude_disabled_apks(self):
+        testdir = tempfile.mkdtemp(
+            prefix=inspect.currentframe().f_code.co_name, dir=self.tmpdir
+        )
+        os.chdir(testdir)
+        os.mkdir('repo')
+        testapk = os.path.join('repo', 'com.politedroid_6.apk')
+        testapk_new = os.path.join('repo', 'Politedroid-1.5.apk')
+        shutil.copy(os.path.join(self.basedir, testapk), testapk_new)
+
+        config = dict()
+        fdroidserver.common.fill_config_defaults(config)
+        config['ndk_paths'] = dict()
+        fdroidserver.common.config = config
+        fdroidserver.update.config = config
+
+        fdroidserver.common.options = Options
+        fdroidserver.update.options = fdroidserver.common.options
+        fdroidserver.update.options.clean = True
+
+        app = fdroidserver.metadata.App()
+        app.id = 'com.politedroid'
+        apps = {app.id: app}
+        build = fdroidserver.metadata.Build()
+        build.versionCode = 6
+        build.disable = "disabled"
+        app['Builds'] = [build]
+
+        knownapks = fdroidserver.common.KnownApks()
+        apks, cachechanged = fdroidserver.update.process_apks({}, 'repo', knownapks, False, apps)
+        self.assertEqual([], apks)
+
 
 if __name__ == "__main__":
     os.chdir(os.path.dirname(__file__))