add test for new labeler script

.github/workflows/labeler_v2.yml

@@ -0,0 +1,17 @@
+name: labeler v2
+
+on:
+  pull_request:
+    types: ['opened', 'ready_for_review', 'reopened', 'synchronize']
+
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.draft == false
+    name: Label the PR size
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install jq
+        run: sudo apt-get install -y jq
+      - name: Run labeler script
+        run: ./devtools/scripts/github-set-pr-label.sh

devtools/scripts/github-set-pr-label.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -e
+
+if [ -z "$GITHUB_API_URL" ]; then
+    GITHUB_API_URL=https://api.github.com
+fi
+
+if [ -z "$GITHUB_TOKEN" ]; then
+    echo "GITHUB_TOKEN is not set"
+    exit 1
+fi
+
+PR_NUMBER=$(jq --raw-output .pull_request.number "$GITHUB_EVENT_PATH")
+LABEL=$(./devtools/scripts/git-diff-label-calc.sh --debug)
+
+curl -sSL \
+    -H "Authorization: token $GITHUB_TOKEN" \
+    -H "Accept: application/vnd.github.v3+json" \
+    -X PATCH \
+    -H "Content-Type: application/json" \
+    -d "{\"labels\":[\"test/$LABEL\"]}" \
+    "$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/issues/$PR_NUMBER"