github/ci: Workaround broken Docker setup (envoyproxy#43486)

Signed-off-by: Ryan Northey <ryan@synca.io>

Author: phlax

.github/workflows/_publish_verify.yml

@@ -68,14 +68,9 @@ jobs:
                     envoy:dev
                     envoy-contrib:contrib-dev
                     envoy-google-vrp:google-vrp-dev)
-                for image in "${IMAGES[@]}"; do
-                    src_name="$(echo ${image} | cut -d: -f1)"
-                    dest_name="$(echo ${image} | cut -d: -f2)"
-                    src="oci-archive:%{{ runner.temp }}/container/build_images/${src_name}.amd64.tar"
-                    dest="docker-daemon:envoyproxy/envoy:${dest_name}"
-                    echo "Copy image: ${src} ${dest}"
-                    skopeo copy -q "${src}" "${dest}"
-                done
+                RUNNER_TEMP="%{{ runner.temp }}"
+                . ./.github/workflows/docker_utils.sh
+                skopeo_copy "${IMAGES[*]}"
               shell: bash
             - run: docker images | grep envoy
               shell: bash
@@ -131,14 +126,9 @@ jobs:
                 if [[ "$CONTRIB_DISTROLESS" == "true" ]]; then
                     IMAGES+=(envoy-contrib-distroless:contrib-distroless-dev)
                 fi
-                for image in "${IMAGES[@]}"; do
-                    src_name="$(echo ${image} | cut -d: -f1)"
-                    dest_name="$(echo ${image} | cut -d: -f2)"
-                    src="oci-archive:%{{ runner.temp }}/container/build_images/${src_name}.amd64.tar"
-                    dest="docker-daemon:envoyproxy/envoy:${dest_name}"
-                    echo "Copy image: ${src} ${dest}"
-                    skopeo copy -q "${src}" "${dest}"
-                done
+                RUNNER_TEMP="%{{ runner.temp }}"
+                . ./.github/workflows/docker_utils.sh
+                skopeo_copy "${IMAGES[*]}"
               shell: bash
             - run: docker images | grep envoy
               shell: bash

.github/workflows/docker_utils.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -eo pipefail
+
+
+skopeo_copy () {
+    local images tempdir
+    read -ra images <<< "${1}"
+    tempdir=$(mktemp -d)
+    for image in "${images[@]}"; do
+        src_name="$(echo "${image}" | cut -d: -f1)"
+        dest_name="$(echo "${image}" | cut -d: -f2)"
+        src="oci-archive:${RUNNER_TEMP}/container/build_images/${src_name}.amd64.tar"
+        dest_file="${tempdir}/${dest_name}.amd64.tar"
+        dest="docker-archive:${dest_file}:envoyproxy/envoy:${dest_name}"
+        echo "Copy image: ${src} ${dest}"
+        skopeo copy -q "${src}" "${dest}"
+        echo "Load docker archive: ${dest_file}"
+        docker load -i "${dest_file}"
+        rm -f "${dest_file}"
+    done
+}