Adds new curl url for docker.io in pin-bundle script

Since we are facing issues with quay.rdoproject to push image from
Prow CI, we plan to move jobs images to docker.io. To properly build the
bundles we need to fix pin-bundle-images script to retrieve the
proper tag.

hack/pin-bundle-images.sh

@@ -50,6 +50,9 @@ for MOD_PATH in $(go list -mod=readonly -m -json all | jq -r '. | select(.Path |
             # for local registry
             if [[ ${LOCAL_REGISTRY} -eq 1 ]]; then
                 REPO_CURL_URL="${CURL_REGISTRY}/v2/${IMAGENAMESPACE}"
+            elif [[ "${CURL_REGISTRY}" == "docker.io" ]]; then
+                # replace docker.io by hub.docker.com to read tags
+                REPO_CURL_URL="https://hub.docker.com/v2/repositories/${IMAGENAMESPACE}"
             else
                 REPO_CURL_URL="https://${CURL_REGISTRY}/api/v1/repository/${IMAGENAMESPACE}"
             fi
@@ -61,6 +64,8 @@ for MOD_PATH in $(go list -mod=readonly -m -json all | jq -r '. | select(.Path |
 
     if [[ ${LOCAL_REGISTRY} -eq 1 && ( "$GITHUB_USER" != "openstack-k8s-operators" || "$BASE" == "$IMAGEBASE" ) ]]; then
         SHA=$(curl -s ${REPO_CURL_URL}/$BASE-operator-bundle/tags/list | jq -r .tags[] | sort -u | grep $REF)
+    elif [[ "${CURL_REGISTRY}" == "docker.io" ]]; then
+        SHA=$(curl -s ${REPO_CURL_URL}/$BASE-operator-bundle/tags/?page_size=100 | sort -u | grep $REF)
     elif [[ "${CURL_REGISTRY}" != "quay.io" ]]; then
         # quay.rdoproject.io doesn't support filter_tag_name, so increase limit to 100
         SHA=$(curl -s ${REPO_CURL_URL}/$BASE-operator-bundle/tag/?onlyActiveTags=true?limit=100 | jq -r .tags[].name | sort -u | grep $REF)