[astro] Publish Helm Chart

(cherry picked from commit fcaee93)
(cherry picked from commit 6388e3b)
(cherry picked from commit d2f7446)

.github/workflows/publish-chart.yml

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+---
+
+name: Publish Chart
+on:
+  push:
+    branches: ['helm-chart/v[0-9]+-[0-9]+-[0-9]']
+jobs:
+  publish-chart:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+
+      - name: Install Helm
+        uses: azure/setup-helm@v1
+        with:
+          version: v3.5.3
+
+      - name: "Build Chart"
+        run: ./scripts/ci/astronomer-airflow-chart-release.sh
+        id: build-chart
+
+      - name: Publish Chart
+        uses: ncipollo/release-action@v1
+        with:
+          allowUpdates: true
+          prerelease: true
+          artifacts: "chart-rel/index.yaml,chart-rel/*.tgz"
+          body: |
+            Add the repo as follows:
+            ```shell
+            helm repo add apache-airflow-oss ${{steps.build-chart.outputs.chart_repo}}
+            ```
+
+            Install the chart:
+            ```shell
+            helm install airflow apache-airflow-oss/airflow --version ${{steps.build-chart.outputs.chart_version}}
+            ```
+          tag: ${{steps.build-chart.outputs.chart_gh_release_tag}}
+          token: ${{ secrets.GITHUB_TOKEN }}

scripts/ci/astronomer-airflow-chart-release.sh

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+#!/usr/bin/env bash
+
+# This file is Not licensed to ASF
+# SKIP LICENSE INSERTION
+
+ROOT_DIRECTORY=$(pwd)
+CHART_DIRECTORY=${ROOT_DIRECTORY}/chart
+CHART_RELEASE_DIRECTORY=${ROOT_DIRECTORY}/chart-rel
+export ROOT_DIRECTORY CHART_DIRECTORY CHART_RELEASE_DIRECTORY
+
+if [[ ! -d "$CHART_DIRECTORY" ]]; then
+  echo "chart directory does not exists ..."
+  echo
+  echo "Current Working Directory: "
+  echo
+  ls -ltr
+fi
+
+CHART_VERSION="$(awk '$1 ~ /^version/ {printf $2;exit;}' "$CHART_DIRECTORY"/Chart.yaml)"
+export CHART_VERSION
+export CHART_GH_RELEASE_TAG="oss-helm-chart/$CHART_VERSION"
+export CHART_PUBLISH_REPO="https://github.com/astronomer/airflow/releases/download/${CHART_GH_RELEASE_TAG}"
+
+# shellcheck disable=SC2153
+export TAG=${GITHUB_REF/refs\/tags\//}
+if [[ "$GITHUB_REF" != *"tags"* ]]; then
+  export TAG=""
+fi
+echo "TAG: $TAG"
+# shellcheck disable=SC2153
+export BRANCH=${GITHUB_REF#refs/*/}
+echo "BRANCH: $BRANCH"
+
+
+function package_chart() {
+    echo "Packaging chart ..."
+    helm package "$CHART_DIRECTORY" --destination "$CHART_RELEASE_DIRECTORY"
+}
+
+function merge_index_yaml() {
+    echo "Merging index.yaml ..."
+    curl https://airflow.apache.org/index.yaml --output index.yaml --silent
+    helm repo index --merge ./index.yaml "${CHART_RELEASE_DIRECTORY}" --url "${CHART_PUBLISH_REPO}"
+}
+
+# If the build is not a tag/release, build a dev version
+if [[ -z ${TAG:=} ]]; then
+    echo
+    echo "Current Chart Version is: ${CHART_VERSION}"
+    echo
+    package_chart && merge_index_yaml
+elif [[ ${TAG:=} == "${BRANCH:=}" ]]; then
+    echo
+    # TODO: Release the chart
+fi
+
+echo "::set-output name=chart_version::${CHART_VERSION}"
+echo "::set-output name=chart_gh_release_tag::${CHART_GH_RELEASE_TAG}"
+echo "::set-output name=chart_repo::${CHART_PUBLISH_REPO}"
+
+
+ls -altr "${CHART_RELEASE_DIRECTORY}/"