Add lambda-p2034 GCC

Author: villevoutilainen

compilers.yaml

@@ -11,6 +11,7 @@ compilers:
     - { image: gcc, name: gcc_contracts, args: lock3-contracts-trunk }
     - { image: gcc, name: gcc_contracts_labels, args: lock3-contracts-labels-trunk }
     - { image: gcc, name: gcc_contracts_nonattr, args: contracts-nonattr-trunk }
+    - { image: gcc, name: gcc_lambda_p2034, args: contracts-lambda-p2034-trunk }
     - { image: gcc, name: gcc_coroutines, args: cxx-coroutines-trunk }
     - { image: gcc, name: gcc_gccrs_master, args: gccrs-master }
     - { image: gcc, name: gcc_modules, args: cxx-modules-trunk }