Tag new failing specs

Author: andrykonchin

spec/tags/core/kernel/system_tags.txt

@@ -22,3 +22,5 @@ slow:Kernel.system raises RuntimeError when `exception: true` is given and the c
 slow:Kernel.system raises Errno::ENOENT when `exception: true` is given and the specified command does not exist
 slow:Kernel#system executes with `sh` if the command is executable but not binary and there is no shebang
 slow:Kernel.system executes with `sh` if the command is executable but not binary and there is no shebang
+fails(in some CI jobs):Kernel#system executes with `sh` if the command is executable but not binary and there is no shebang
+fails(in some CI jobs):Kernel.system executes with `sh` if the command is executable but not binary and there is no shebang

spec/tags/optional/capi/object_tags.txt

@@ -0,0 +1,3 @@
+fails:CApiObject allocator accessors rb_define_alloc_func sets up the allocator
+fails:CApiObject allocator accessors rb_define_alloc_func sets up the allocator for a subclass of String
+fails:CApiObject allocator accessors rb_define_alloc_func sets up the allocator for a subclass of Array