build: add major release action

This action reminds collaborators of the upcoming
major release date. In the future, this action can
also update and create the branches (that's why the
action name is generic).

PR-URL: https://github.com/nodejs/node/pull/56199
Refs: https://github.com/nodejs/node/pull/55732
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

.github/workflows/major-release.yml

@@ -0,0 +1,48 @@
+name: Major Release
+
+on:
+  schedule:
+    - cron: 0 0 15 2,8 *  # runs at midnight UTC every 15 February and 15 August
+
+permissions:
+  contents: read
+
+jobs:
+  create-issue:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - name: Check for release schedule
+        id: check-date
+        run: |
+          # Get the current month and day
+          MONTH=$(date +'%m')
+          DAY=$(date +'%d')
+          # We'll create the reminder issue two months prior the release
+          if [[ "$MONTH" == "02" || "$MONTH" == "08" ]] && [[ "$DAY" == "15" ]]; then
+            echo "create_issue=true" >> "$GITHUB_ENV"
+          fi
+      - name: Retrieve next major release info from nodejs/Release
+        if: env.create_issue == 'true'
+        run: |
+          curl -L https://github.com/nodejs/Release/raw/HEAD/schedule.json | \
+          jq -r 'to_entries | map(select(.value.start | strptime("%Y-%m-%d") | mktime > now)) | first | "VERSION=" + .key + "\nRELEASE_DATE=" + .value.start' >> "$GITHUB_ENV"
+      - name: Compute max date for landing semver-major PRs
+        if: env.create_issue == 'true'
+        run: |
+          echo "PR_MAX_DATE=$(date -d "$RELEASE_DATE -1 month" +%Y-%m-%d)" >> "$GITHUB_ENV"
+      - name: Create release announcement issue
+        if: env.create_issue == 'true'
+        run: |
+         gh issue create --repo "${GITHUB_REPOSITORY}" \
+           --title "Upcoming Node.js Major Release ($VERSION)" \
+           --body-file -<<EOF
+            A reminder that the next Node.js **SemVer Major release** is scheduled for **${RELEASE_DATE}**.
+            All commits that were landed until **${PR_MAX_DATE}** (one month prior to the release) will be included in the next semver major release. Please ensure that any necessary preparations are made in advance.
+            For more details on the release process, consult the [Node.js Release Working Group repository](https://github.com/nodejs/release).
+
+            cc: @nodejs/collaborators
+         EOF
+        env:
+          GH_TOKEN: ${{ github.token }}