chore(ci): Include charts-only CI in this repo

.github/scripts/check-releasenotes.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+
+set -e
+
+# Check if release notes have been changed
+# Usage ./check-releasenotes.sh path
+
+# require yq
+command -v yq >/dev/null 2>&1 || {
+    printf >&2 "%s\n" "yq (https://github.com/mikefarah/yq) is not installed. Aborting."
+    exit 1
+}
+
+# Absolute path of repository
+repository=$(git rev-parse --show-toplevel)
+
+# Allow for a specific chart to be passed in as a argument
+if [ $# -ge 1 ] && [ -n "$1" ]; then
+    root="$1"
+    chart_file="${1}/Chart.yaml"
+    if [ ! -f "$chart_file" ]; then
+        printf >&2 "File %s\n does not exist.\n" "${chart_file}"
+        exit 1
+    fi
+
+    cd $root
+
+    if [ -z "$DEFAULT_BRANCH" ]; then
+      DEFAULT_BRANCH=$(git remote show origin | awk '/HEAD branch/ {print $NF}')
+    fi
+
+    CURRENT=$(cat Chart.yaml | yq e '.annotations."artifacthub.io/changes"' -P -)
+
+    if [ "$CURRENT" == "" ] || [ "$CURRENT" == "null" ]; then
+      printf >&2 "Changelog annotation has not been set in %s!\n" "$chart_file"
+      exit 1
+    fi
+
+    DEFAULT_BRANCH=$(git remote show origin | awk '/HEAD branch/ {print $NF}')
+    ORIGINAL=$(git show origin/$DEFAULT_BRANCH:./Chart.yaml | yq e '.annotations."artifacthub.io/changes"' -P -)
+
+    if [ "$CURRENT" == "$ORIGINAL" ]; then
+      printf >&2 "Changelog annotation has not been updated in %s!\n" "$chart_file"
+      exit 1
+    fi
+else
+    printf >&2 "%s\n" "No chart folder has been specified."
+    exit 1
+fi