try to fix docker build for latest image

the latest tags cannot be downloaded directly by URL.

Author: ManuelHu

.dockerhub/hooks/build

@@ -16,7 +16,14 @@ elif [[ $(echo "$DOCKER_TAG" | sed 's/.*-//') == "slim" ]]; then
         --build-arg REMAGE_VERSION="$_version" \
         -f "$DOCKERFILE_PATH" -t "$IMAGE_NAME" .
 
-else  # use stable base image for all tagged versions
+# use stable base image for all tagged versions
+elif [[ "$DOCKER_TAG" == "latest" ]]; then
+    docker build \
+        --build-arg REMAGE_BASE_FLAVOR="latest" \
+        --build-arg REMAGE_VERSION="$SOURCE_BRANCH" \
+        -f "$DOCKERFILE_PATH" -t "$IMAGE_NAME" .
+
+else
     docker build \
         --build-arg REMAGE_BASE_FLAVOR="stable" \
         --build-arg REMAGE_VERSION="$DOCKER_TAG" \