Firebase App Distribution Android - GitLab CI

.gitlab-ci.yml

.android_build:
  image: openjdk:8-jdk
  stage: build # kind of job
  variables:
    ANDROID_COMPILE_SDK: "29"
    ANDROID_BUILD_TOOLS: "29.0.3"
    ANDROID_SDK_TOOLS:   "4333796"
    FLUTTER_VERSION: "https://storage.googleapis.com/flutter_infra/releases/stable/linux/flutter_linux_1.22.6-stable.tar.xz"

  before_script:
    # Install Firebase
    - curl -L https://firebase.tools/bin/linux/latest -o firebase
    - chmod +x firebase
    - mv firebase /usr/local/bin/
    # Install Android
    - apt-get --quiet update --yes
    - apt-get --quiet install --yes wget tar unzip lib32stdc++6 lib32z1
    - wget --quiet --output-document=android-sdk.zip https://dl.google.com/android/repository/sdk-tools-linux-${ANDROID_SDK_TOOLS}.zip
    - unzip -d android-sdk-linux android-sdk.zip
    - echo y | android-sdk-linux/tools/bin/sdkmanager "platforms;android-${ANDROID_COMPILE_SDK}" >/dev/null
    - echo y | android-sdk-linux/tools/bin/sdkmanager "platform-tools" >/dev/null
    - echo y | android-sdk-linux/tools/bin/sdkmanager "build-tools;${ANDROID_BUILD_TOOLS}" >/dev/null
    - export ANDROID_HOME=$PWD/android-sdk-linux
    - export PATH=$PATH:$PWD/android-sdk-linux/platform-tools/
    ## temporarily disable checking for EPIPE error and use yes to accept all licenses
    - set +o pipefail
    - yes | android-sdk-linux/tools/bin/sdkmanager --licenses
    - set -o pipefail
    # Install Flutter
    - wget --output-document=flutter-sdk.tar.xz $FLUTTER_VERSION
    - tar -xf flutter-sdk.tar.xz
    - export PATH=$PATH:$PWD/flutter/bin
    - flutter precache
    - flutter packages get
    - flutter clean

stages:
- test # All jobs related for testing such as Unit Test
- build # All jobs related for building app for iOS and Android

####
#### flutter debug
####
flutter_build_debug: #Job name
  extends: .android_build
  retry: 2
  script:
     - flutter build apk --flavor dev
  artifacts:
    paths:
      - build/app/outputs/flutter-apk/app-dev-release.apk


####
#### flutter release
####
flutter_build_release: #Job name
  extends: .android_build
  retry: 2
  script:
     - flutter build apk --release --flavor prod
     - flutter build appbundle --release --flavor prod
     - ./bin/app_distribution.sh
  artifacts:
    paths:
      - build/app/outputs/flutter-apk/app-prod-release.apk
      - build/app/outputs/bundle/prodRelease/app-prod-release.aab

app_distribution.sh

#!/usr/bin/env bash

RELEASE_NOTE=$(git log -1 --oneline --format=%s)

firebase appdistribution:distribute build/app/outputs/flutter-apk/app-prod-release.apk   \
    --token "$FIREBASE_TOKEN" \
    --app "$APP_ID" \
    --release-notes "$RELEASE_NOTE" --testers-file testers.txt

Ok Thanks @empeje

I created new one with this:

image: "ghcr.io/cirruslabs/flutter:3.22.3"

stages:
  - build
  - deploy

variables:
  FIREBASE_CLI_VERSION: "11.5.0"
  GRADLE_USER_HOME: "/builds/$CI_PROJECT_NAMESPACE/$CI_PROJECT_NAME/.gradle"

cache:
  key: "${CI_JOB_NAME}"
  paths:
    - .gradle/wrapper
    - .gradle/caches

before_script:
  - flutter doctor
  - flutter pub get

build:
  stage: build
  script:
    - flutter build apk --release
    - ls -la build/app/outputs/flutter-apk/
  artifacts:
    paths:
      - build/app/outputs/flutter-apk/app-release.apk

deploy:
  stage: deploy
  dependencies:
    - build
  only:
    - main
  script:
    - curl -sL https://firebase.tools | bash
    - firebase appdistribution:distribute build/app/outputs/flutter-apk/app-release.apk --app $FIREBASE_APP_ID --token $FIREBASE_TOKEN --groups "testers" --release-notes "New version of ANA ONLINE is available"