Add Telegram notifications steps

.github/workflows/build.yaml

@@ -117,6 +117,21 @@ jobs:
             build/app/outputs/flutter-apk/app-*.apk
             build/app/outputs/flutter-apk/app-*.apk.sha1
 
+      - name: Send dev APK to testers Telegram group
+        if: !startsWith(github.ref, 'refs/tags/v')
+        env:
+          TELEGRAM_BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}
+          TELEGRAM_CHAT_ID: ${{ secrets.TELEGRAM_CHAT_ID }}
+        run: |
+          actual_version="$(git describe --tags --always | sed -E 's/(-([0-9]+)-g([0-9a-f]+))?$/.r\2-\3/g')"
+          curl --silent --show-error --fail-with-body \
+            -F "chat_id=${TELEGRAM_CHAT_ID}" \
+            -F "document=@build/app/outputs/flutter-apk/app-arm64-v8a-dev-release.apk" \
+            -F "caption=New version: ${actual_version}" \
+            "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendDocument" \
+            >/dev/null
+        continue-on-error: true
+
   build-web:
     name: Build app for web
     runs-on: ubuntu-latest
@@ -218,3 +233,17 @@ jobs:
           files: |
             build/app-*.apk
           fail_on_unmatched_files: true
+
+      - name: Send release info to testers Telegram group
+        env:
+          TELEGRAM_BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}
+          TELEGRAM_CHAT_ID: ${{ secrets.TELEGRAM_CHAT_ID }}
+        run: |
+          release_url="${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/releases/tag/${GITHUB_REF_NAME}"
+          curl --silent --show-error --fail-with-body \
+            -F "chat_id=${TELEGRAM_CHAT_ID}" \
+            -F "parse_mode=MarkdownV2" \
+            -F "text=New release: [${GITHUB_REF_NAME}](${release_url})" \
+            "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
+            >/dev/null
+        continue-on-error: true