Push container images properly:

Because of the way CI is built (2 self-hosted runners),
CI was not pushing container images when building on main.
This was because PR's would build the images and the would
be locally in the Docker cache. Then when main ran,
hook-lk-containers.sh would run and see that the image
existed in the local Docker cache already and stop before
pushing.

Signed-off-by: Jacob Weinstock <jakobweinstock@gmail.com>

Author: jacobweinstock

bash/hook-lk-containers.sh

@@ -31,6 +31,9 @@ function build_hook_linuxkit_container() {
 	log debug "Checking if image ${container_oci_ref} exists in local registry"
 	if [[ -n "$(docker images -q "${container_oci_ref}")" ]]; then
 		log info "Image ${container_oci_ref} exists in local registry, skipping build"
+		# we try to push here because a previous build may have created the image
+		# this is the case for GitHub Actions CI because we build PRs on the same self-hosted runner
+		push_hook_linuxkit_container "${container_oci_ref}"
 		return 0
 	fi
 
@@ -55,6 +58,15 @@ function build_hook_linuxkit_container() {
 
 	log info "Built ${container_oci_ref} from ${container_dir} for platform ${DOCKER_ARCH}"
 
+	push_hook_linuxkit_container "${container_oci_ref}"
+
+	return 0
+}
+
+
+function push_hook_linuxkit_container() {
+	declare container_oci_ref="${1}"
+
 	# Push the image to the registry, if DO_PUSH is set to yes
 	if [[ "${DO_PUSH}" == "yes" ]]; then
 		docker push "${container_oci_ref}" || {
@@ -64,6 +76,4 @@ function build_hook_linuxkit_container() {
 	else
 		log info "Skipping push of ${container_oci_ref} to registry; set DO_PUSH=yes to push."
 	fi
-
-	return 0
 }