Feat: add generate release note script

Signed-off-by: tico88612 <[email protected]>

hack/gen_relnotes.sh

@@ -0,0 +1,36 @@
+#!/bin/bash -e
+set -x
+
+if [[ ! -v GITHUB_TOKEN ]]; then
+    echo "GITHUB_TOKEN is not set, please set it with a token with read permissions on commits and PRs"
+    exit 1
+fi
+
+script_dir=$(dirname "$(readlink -f "$0")")
+
+branch=$1
+from=$2
+to=$3
+release_notes=$(mktemp)
+
+end() {
+    rm $release_notes
+}
+
+trap end EXIT SIGINT SIGTERM SIGSTOP
+
+GOFLAGS=-mod=mod go run k8s.io/release/cmd/[email protected] \
+    --branch $branch \
+    --required-author "" \
+    --org metallb \
+    --dependencies=false \
+    --repo metallb-operator \
+    --start-sha $from \
+    --end-sha $to \
+    --output $release_notes
+
+cat $release_notes
+
+
+echo "Contributors"
+git log --format="%aN" $(git merge-base $to $from)..$to | sort -u | tr '\n' ',' | sed -e 's/,/, /g'