automation: Add script for making new release

Introduce ./tools/make_release.sh doing:
 0. Create `new_release` branch.
 1. Bump `Cargo.toml` to next minor version.
 2. Generate CHANGELOG line in interactive way.
 3. Upload `new_release` branch to github.

Signed-off-by: Gris Ge <fge@redhat.com>

tools/make_release.sh

@@ -0,0 +1,87 @@
+#!/bin/bash -ex
+# SPDX-License-Identifier: MIT
+
+MAIN_BRANCH_NAME="main"
+UPSTERAM_GIT="https://github.com/rust-netlink/netlink-packet-route.git"
+TMP_CHANGELOG_FILE=$(mktemp)
+EDITOR="${EDITOR:-vim}"
+
+if ! command -v jq &> /dev/null
+then
+    echo "Please install jq to proceed"
+    exit 1
+fi
+
+if ! command -v cargo set-version &> /dev/null
+then
+    echo 'Please install cargo-edit via `cargo install cargo-edit` to proceed'
+    exit 1
+fi
+
+
+CHANGLOG_FORMAT="
+### Breaking changes\n\
+ - N/A\n\
+\n\
+### New features\n\
+ - N/A\n\
+\n\
+### Bug fixes"
+
+function cleanup {
+    rm -f $TMP_CHANGELOG_FILE
+}
+
+trap cleanup ERR EXIT
+
+CODE_BASE_DIR=$(readlink -f "$(dirname -- "$0")/..");
+
+cd $CODE_BASE_DIR;
+
+CUR_VERSION=$(cargo metadata --no-deps --format-version 1 | \
+    jq '.packages[0].version' --raw-output)
+CUR_MAJOR_VERSION=$(echo $CUR_VERSION|cut -f1 -d.)
+CUR_MINOR_VERSION=$(echo $CUR_VERSION|cut -f2 -d.)
+CUR_MICRO_VERSION=$(echo $CUR_VERSION|cut -f3 -d.)
+
+# TODO: Be smart on bumping major, micro or minor version by checking API
+#       stability
+NEXT_VERSION="${CUR_MAJOR_VERSION}.$((CUR_MINOR_VERSION + 1)).0";
+
+git branch new_release || true
+git checkout new_release
+git fetch upstream || (git remote add upstream $UPSTERAM_GIT; \
+    git fetch upstream)
+git reset --hard upstream/$MAIN_BRANCH_NAME
+
+echo "Checking 'cargo publish --dry-run'"
+
+cargo publish --dry-run
+
+echo "# Changelog" > $TMP_CHANGELOG_FILE
+echo "## [$NEXT_VERSION] - $(date +%F)" >> $TMP_CHANGELOG_FILE
+echo -e $CHANGLOG_FORMAT >> $TMP_CHANGELOG_FILE
+git log --oneline --format=" - %s. (%h)" \
+    v${CUR_VERSION}..upstream/$MAIN_BRANCH_NAME -- | \
+    grep -v -E '^ - test:' | \
+    grep -v -E '^ - Bump version' | \
+    grep -v -E 'cargo clippy'  >> $TMP_CHANGELOG_FILE
+echo "" >> $TMP_CHANGELOG_FILE
+
+$EDITOR $TMP_CHANGELOG_FILE
+if [ $(wc -l < $TMP_CHANGELOG_FILE) -lt 2 ];then
+    echo "No CHANGELOG addition, exiting"
+    git checkout CHANGELOG 
+    exit 1
+fi
+
+cargo set-version $NEXT_VERSION
+
+CHANGELOG_STR=$(sed -n '3,$p' $TMP_CHANGELOG_FILE|tr '#' '=')
+sed -n '2,$p' CHANGELOG >> $TMP_CHANGELOG_FILE
+
+mv $TMP_CHANGELOG_FILE $CODE_BASE_DIR/CHANGELOG
+git commit --signoff $CODE_BASE_DIR/CHANGELOG -m "New release ${NEXT_VERSION}" \
+    -m "$CHANGELOG_STR"
+git push origin +new_release
+echo "Please visit github to create pull request for this breach"