Skip non-image files when loading docker images in local_e2e_tests (#…

…5465)

When the "kubeapps general" workflow fails in the `local_e2e_tests` step, it is possible
that the corresponding `e2e_tests_[GROUP]_report` artifact is generated and uploaded
to the GHA workspace for the workflow, and in the following attempt after retrying the failed
jobs, it tries to 'docker load' those artifacts that aren't docker images. With the changes in 
this commit, we are filtering those non-image artifacts.

Signed-off-by: Jesús Benito Calzada <bjesus@vmware.com>

.github/workflows/kubeapps.yaml

@@ -456,6 +456,10 @@ jobs:
           source ./script/lib/liblog.sh
           for path in /tmp/images/*; do 
             image=$(basename "$path")
+            if [[ "${image}" != *"-image" ]]; then
+              echo "::notice ::Skipping artifact ${image}, it's not a docker image"          
+              continue
+            fi
             info "Loading image ${image}"
             kind load image-archive "${path}/${image}.tar" --name kubeapps-ci; 
           done