stops using system cmake for make testnet/mainnet uses cmake 3.11.9

Makefile

@@ -72,10 +72,12 @@ CC_DOCKER_FILE?=utils/docker/images/lthn-chain/Dockerfile
 all: help
 
 testnet:
-	cmake --workflow testnet
+	$(MAKE) configure TESTNET=1
+	CONAN_HOME=$(CONAN_CACHE) $(CONAN_EXECUTABLE) build .
 
 mainnet:
-	cmake --workflow mainnet
+	$(MAKE) configure TESTNET=0
+	CONAN_HOME=$(CONAN_CACHE) $(CONAN_EXECUTABLE) build .
 
 release: docs build
 	(cd $(BUILD_FOLDER) && cpack)

conanfile.py

@@ -21,6 +21,10 @@ class BlockchainConan(ConanFile):
         "boost/*:without_test": True
     }
 
+    tool_requires = [
+        "cmake/3.31.9"
+    ]
+
     requires = [
         "zlib/1.3.1",
         "boost/1.85.0",