Add lgtm.yml

Signed-off-by: Stephen Sun <stephens@nvidia.com>

Author: stephenxs

lgtm.yml

@@ -0,0 +1,39 @@
+path_classifiers:
+  test:
+    exclude: tests
+extraction:
+  python:
+    python_setup:
+      version: "2"
+  cpp:
+    prepare:
+      packages:
+      - libxml-simple-perl
+      - aspell
+      - aspell-en
+      - libhiredis-dev
+      - libnl-3-dev
+      - libnl-genl-3-dev
+      - libnl-route-3-dev
+      - libnl-nf-3-dev
+      - swig3.0
+      - libpython2.7-dev
+      - libgtest-dev
+      - dh-exec
+      - doxygen
+      - graphviz
+    after_prepare:
+      - git clone -b 201911 https://github.com/Azure/sonic-swss-common; pushd sonic-swss-common; ./autogen.sh; fakeroot dpkg-buildpackage -us -uc -b; popd
+      - dpkg-deb -x libswsscommon_1.0.0_amd64.deb $LGTM_WORKSPACE
+      - dpkg-deb -x libswsscommon-dev_1.0.0_amd64.deb $LGTM_WORKSPACE
+      - git clone -b 201911 --recursive https://github.com/Azure/sonic-sairedis; pushd sonic-sairedis; ./autogen.sh; DEB_BUILD_OPTIONS=nocheck SWSS_COMMON_INC="$LGTM_WORKSPACE/usr/include" SWSS_COMMON_LIB="$LGTM_WORKSPACE/usr/lib/x86_64-linux-gnu" fakeroot debian/rules binary-syncd-vs; popd
+      - dpkg-deb -x libsairedis_1.0.0_amd64.deb $LGTM_WORKSPACE
+      - dpkg-deb -x libsairedis-dev_1.0.0_amd64.deb $LGTM_WORKSPACE
+      - dpkg-deb -x libsaimetadata_1.0.0_amd64.deb $LGTM_WORKSPACE
+      - dpkg-deb -x libsaimetadata-dev_1.0.0_amd64.deb $LGTM_WORKSPACE
+      - dpkg-deb -x libsaivs_1.0.0_amd64.deb $LGTM_WORKSPACE
+      - dpkg-deb -x libsaivs-dev_1.0.0_amd64.deb $LGTM_WORKSPACE
+    configure:
+      command:
+      - ./autogen.sh
+      - ./configure --prefix=/usr --with-extra-inc=$LGTM_WORKSPACE/usr/include --with-extra-lib=$LGTM_WORKSPACE/usr/lib/x86_64-linux-gnu