Cleanup ubuntu2004 build

Signed-off-by: Appu Goundan <appu@google.com>

Author: loosebazooka

CONTRIB.md

@@ -1,6 +1,6 @@
 # Environment Setup
 
-To build and test these images you will need to install `bazel`.
+To build and test these images you will need to install `bazel`. This build is known to work with version 3.4.1
 
 To install a pre-commit hook that will automatically run tests, run the following command:
 

Makefile

@@ -11,6 +11,7 @@ test:
 	bazel test --test_output=errors //... --action_env=GIT_ROOT=$(PWD) --sandbox_writable_path=$(PWD) --verbose_failures --incompatible_bzl_disallow_load_after_statement=false
 	cd ubuntu1604 && bazel test $(BAZEL_TEST_OPTS) $(CONTAINER_TEST_TARGETS) && cd ..
 	cd ubuntu1804 && bazel test $(BAZEL_TEST_OPTS) $(CONTAINER_TEST_TARGETS) && cd ..
+	cd ubuntu2004 && bazel test $(BAZEL_TEST_OPTS) $(CONTAINER_TEST_TARGETS) && cd ..
 	cd debian9 && bazel test $(BAZEL_TEST_OPTS) $(CONTAINER_TEST_TARGETS) && cd ..
 	cd debian10 && bazel test $(BAZEL_TEST_OPTS) $(CONTAINER_TEST_TARGETS) && cd ..
 	cd debian11 && bazel test $(BAZEL_TEST_OPTS) $(CONTAINER_TEST_TARGETS) && cd ..

ubuntu2004/BUILD

@@ -59,7 +59,6 @@ download_pkgs(
 security_check(
     name = "security_metadata",
     image = "gcr.io/gcp-runtimes/ubuntu_20_0_4:latest",
-
 )
 
 # Transform the packages metadata csv produced by download_pkgs into a YAML