build: retain conan cache on clean build

This patch modifies the build script to retain the conan cache.

Signed-off-by: Mykhailo Lohvynenko <mykhailo_lohvynenko@epam.com>
Reviewed-by: Mykola Kobets <mykola_kobets@epam.com>
Reviewed-by: Oleksandr Grytsov <oleksandr_grytsov@epam.com>

Author: mlohvynenko

build.sh

@@ -43,12 +43,6 @@ clean_build() {
     print_next_step "Clean artifacts"
 
     rm -rf ./build/
-    conan remove 'gtest*' -c
-    conan remove 'grpc*' -c
-    conan remove 'poco*' -c
-    conan remove 'libcu*' -c
-    conan remove 'opens*' -c
-    conan remove 'pkcs11provider*' -c
 }
 
 conan_setup() {