Add chat notifier workflow

Author: Numerio

.github/workflows/telegram-notifier.yml

@@ -0,0 +1,61 @@
+name: Push -> Telegram (read-only tags)
+on:
+  push:
+    branches:
+      - '**'
+
+permissions:
+  contents: read
+
+jobs:
+  notify:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout pushed ref (full)
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Find latest rev tag
+        id: latest
+        run: |
+          # find latest rev-* tag by creation date; leave empty if none
+          entry=$(git for-each-ref --sort=-creatordate --format='%(refname:short) %(creatordate:unix)' refs/tags | grep '^rev-[0-9]\+' | head -n1 || true)
+          if [ -z "$entry" ]; then
+            echo "::set-output name=tag::"
+            echo "::set-output name=ts::"
+          else
+            tag=$(echo "$entry" | awk '{print $1}')
+            ts=$(echo "$entry" | awk '{print $2}')
+            echo "::set-output name=tag::$tag"
+            echo "::set-output name=ts::$ts"
+          fi
+
+      - name: Build Telegram message
+        id: message
+        run: |
+          repo="${GITHUB_REPOSITORY}"
+          branch="${GITHUB_REF#refs/heads/}"
+          sha_full="${GITHUB_SHA}"
+          sha="${sha_full::7}"
+          author="$(git --no-pager show -s --format='%an' $GITHUB_SHA || echo '')"
+          msg="$(git --no-pager show -s --format='%s' $GITHUB_SHA || echo '')"
+          latest_tag="${{ steps.latest.outputs.tag }}"
+          tag_part="Rev: ${latest_tag:-(none)}"
+          body="Repo: ${repo}%0ABranch: ${branch}%0ACommit: ${sha}%0AAuthor: ${author}%0AMessage: ${msg}%0A${tag_part}"
+          echo "::set-output name=body::$body"
+
+      - name: Send Telegram notification
+        env:
+          TELEGRAM_BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}
+          TELEGRAM_CHAT_ID: ${{ secrets.TELEGRAM_CHAT_ID }}
+        run: |
+          if [ -z "$TELEGRAM_BOT_TOKEN" ] || [ -z "$TELEGRAM_CHAT_ID" ]; then
+            echo "Missing TELEGRAM_BOT_TOKEN or TELEGRAM_CHAT_ID secrets; skipping send."
+            exit 0
+          fi
+          body="${{ steps.message.outputs.body }}"
+          curl -sS --fail -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
+            -d "chat_id=${TELEGRAM_CHAT_ID}" \
+            -d "text=${body}" \
+            -d "parse_mode=HTML"