Fix and re-introduce markdown linting using mdlint

[aruneshpa]

The current mdlint image referenced by make lint target no longer exists. We should generate a new image, push it to the registry and update the make target to reference that image.

As of now, the GH actions are not linting markdown files. Once we fix the image, we can re-introduce markdown linting.

[akutz]

# Copyright 2019 The Kubernetes Authors.
#
# 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.

all: build

MDLINT_CLI_VERSION ?= 0.31.1
IMAGE_NAME ?= gcr.io/cluster-api-provider-vsphere/extra/mdlint
IMAGE_TAG ?= $(IMAGE_NAME):$(MDLINT_CLI_VERSION)

build:
    docker build --build-arg MDLINT_CLI_VERSION=$(MDLINT_CLI_VERSION) -t $(IMAGE_TAG) .
    docker tag $(IMAGE_TAG) $(IMAGE_NAME):latest
.PHONY: build

push:
    docker push $(IMAGE_TAG)
    docker push $(IMAGE_NAME):latest
.PHONY: push

# Copyright 2019 The Kubernetes Authors.
#
# 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.

################################################################################
##                             INSTALL MDLINT                                 ##
################################################################################
FROM node:12.6.0-slim as build
ARG MDLINT_CLI_VERSION=0.31.1
ENV MDLINT_CLI_VERSION=${MDLINT_CLI_VERSION}
RUN npm install -g --prefix=/md markdownlint-cli@${MDLINT_CLI_VERSION} && \
    ln -s /md/lib/node_modules/markdownlint-cli/markdownlint.js /md/lint

################################################################################
##                               RUN MDLINT                                   ##
################################################################################
FROM gcr.io/distroless/nodejs:latest
LABEL "maintainer" "Andrew Kutz <akutz@vmware.com>"
COPY --from=build /md/ /md/
WORKDIR /build
CMD [ "/md/lint", "-i", "vendor", "." ]
ENTRYPOINT [ "/nodejs/bin/node" ]