Add lgtm.yml to install cmake 3.16.3 ~ Ubuntu 20.04 LTS

Author: hoffmang9

lgtm.yml

@@ -0,0 +1,9 @@
+extraction:
+  cpp:
+    after_prepare:
+    - "mkdir custom_cmake"
+    - "wget --quiet -O - \"https://cmake.org/files/v3.16/cmake-3.16.3-Linux-x86_64.tar.gz\"\
+      \ | tar --strip-components=1 -xz -C custom_cmake"
+    - "export PATH=$(pwd)/custom_cmake/bin:${PATH}"
+    - "mkdir $LGTM_SRC/_lgtm_build_dir"
+    - "cd $LGTM_SRC/_lgtm_build_dir"