add dockerfile to support offline registry builds

.ci/Dockerfile.offline

@@ -0,0 +1,48 @@
+#
+#   Copyright 2020-2023 Red Hat, Inc.
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+FROM registry.access.redhat.com/ubi8/go-toolset:1.18 AS builder
+
+# Set user as root
+USER root
+
+# Install yq
+RUN curl -sL -O https://github.com/mikefarah/yq/releases/download/v4.9.5/yq_linux_amd64 -o /usr/local/bin/yq && mv ./yq_linux_amd64 /usr/local/bin/yq && chmod +x /usr/local/bin/yq
+
+COPY . /registry
+
+# Download the registry build tools
+RUN git clone https://github.com/devfile/registry-support.git /registry-support
+
+# Download all the offline parent devfiles
+RUN bash /registry-support/build-tools/dl_parent_devfiles.sh
+
+# Download all the offline starter projects
+RUN bash /registry-support/build-tools/dl_starter_projects.sh
+
+# Update all devfiles to use offline starter projects
+RUN bash /registry-support/build-tools/update_devfiles_offline.sh
+
+# Run the registry build tools
+RUN bash /registry-support/build-tools/build.sh /registry /build
+
+# Extract archived resources
+RUN bash /registry-support/build-tools/extract_resources.sh
+
+FROM quay.io/devfile/devfile-index-base:next
+
+# Set user as non-root
+USER 1001
+
+COPY --from=builder /build /registry

.ci/build.sh

@@ -15,4 +15,9 @@
 
 ABSOLUTE_PATH="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
-docker build --no-cache -t devfile-index -f $ABSOLUTE_PATH/Dockerfile $ABSOLUTE_PATH/..
+if [ $# -eq 1 ] && [ $1 == "offline" ]
+then
+    docker build --no-cache -t devfile-index -f $ABSOLUTE_PATH/Dockerfile.offline $ABSOLUTE_PATH/..
+else
+    docker build --no-cache -t devfile-index -f $ABSOLUTE_PATH/Dockerfile $ABSOLUTE_PATH/..
+fi