Revert "Disable all jobs for testing"

This reverts commit c7887978a35db2b5c0113269268cfc71775aeef2.
diff --git a/mbedtls-release-ci-testing.yaml b/mbedtls-release-ci-testing.yaml
index 6795b9d..e22cfd9 100644
--- a/mbedtls-release-ci-testing.yaml
+++ b/mbedtls-release-ci-testing.yaml
@@ -7,7 +7,7 @@
       Otherwise not much will happen.
       <p>
       Choose the branch of <tt>mbedtls-test</tt> under <tt>TEST_BRANCH</tt>.
-    disabled: true
+    disabled: false
     name: mbedtls-release-ci-testing
     parameters:
     - string: