tests: Use $HOME/go as fallback for $GOPATH

Considering that someone may want to run the tests locally, we shouldn't
rely on having GITHUB_WORKSPACE exported, and fallback to $HOME/go if
needed.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

tests/common.bash

@@ -335,8 +335,10 @@ function check_containerd_config_for_kata() {
 }
 
 function ensure_yq() {
-    : "${GOPATH:=${GITHUB_WORKSPACE}}"
+    : "${GOPATH:=${GITHUB_WORKSPACE:-$HOME/go}}"
     export GOPATH
     export PATH="${GOPATH}/bin:${PATH}"
     INSTALL_IN_GOPATH=true "${repo_root_dir}/ci/install_yq.sh"
 }
+
+