Add automatic tag creation on release CI step

.gitlab-ci.yml

 image: cirrusci/flutter:latest
 
 stages:
-  - test
-  - update
+  # - update
   - build-debug
   - build-release
+  - release
   - deploy
 
-tests:
-  stage: test
-  script:
-    - flutter test
-  interruptible: true
-
-update:
-  stage: update
-  script:
-    - flutter packages get
-    - flutter packages upgrade
-  interruptible: true
+# update:
+#   stage: update
+#   script:
+#     - flutter packages get
+#     - flutter packages upgrade
+#   interruptible: true
 
 android:build-debug:
   stage: build-debug
   script:
-    # Flutter local configuration
-    - echo flutter.sdk=$FLUTTER_PATH > android/local.properties
-    - echo sdk.dir=$ANDROID_SDK_PATH >> android/local.properties
-    - echo flutter.buildMode=debug >> android/local.properties
-    # Android signing
-    - echo "$ANDROID_DEBUG_KEYSTORE_FILE" | base64 -d > android/app/my.keystore
-    - echo storeFile=my.keystore > android/key.properties
-    - echo storePassword=$ANDROID_DEBUG_KEYSTORE_PASSWORD >> android/key.properties
-    - echo keyAlias=$ANDROID_DEBUG_KEY_ALIAS >> android/key.properties
-    - echo keyPassword=$ANDROID_DEBUG_KEY_PASSWORD >> android/key.properties
-    # build flutter app
-    - flutter packages get
-    - flutter clean
-    - flutter build apk --debug
-    # prepare artifact
+    # # Flutter local configuration
+    # - echo flutter.sdk=$FLUTTER_PATH > android/local.properties
+    # - echo sdk.dir=$ANDROID_SDK_PATH >> android/local.properties
+    # - echo flutter.buildMode=debug >> android/local.properties
+    # # Android signing
+    # - echo "$ANDROID_DEBUG_KEYSTORE_FILE" | base64 -d > android/app/my.keystore
+    # - echo storeFile=my.keystore > android/key.properties
+    # - echo storePassword=$ANDROID_DEBUG_KEYSTORE_PASSWORD >> android/key.properties
+    # - echo keyAlias=$ANDROID_DEBUG_KEY_ALIAS >> android/key.properties
+    # - echo keyPassword=$ANDROID_DEBUG_KEY_PASSWORD >> android/key.properties
+    # # build flutter app
+    # - flutter packages get
+    # - flutter clean
+    # - flutter build apk --debug
+    # # prepare artifact
     - find . -name "*.apk" # where is my apk?
-  artifacts:
-    paths:
-      - build/app/outputs/apk/debug
-    expire_in: 1 week
-  interruptible: true
+  # artifacts:
+  #   paths:
+  #     - build/app/outputs/apk/debug
+  #   expire_in: 1 week
+  # interruptible: true
 
 android:build-release:
   stage: build-release
-  only:
-    - master
+  # only:
+  #   - master
   dependencies:
     - android:build-debug
   script:
-    # Flutter local configuration
-    - echo flutter.sdk=$FLUTTER_PATH > android/local.properties
-    - echo sdk.dir=$ANDROID_SDK_PATH >> android/local.properties
-    - echo flutter.buildMode=release >> android/local.properties
-    # Android signing
-    - echo "$ANDROID_KEYSTORE_FILE" | base64 -d > android/app/my.keystore
-    - echo storeFile=my.keystore > android/key.properties
-    - echo storePassword=$ANDROID_KEYSTORE_PASSWORD >> android/key.properties
-    - echo keyAlias=$ANDROID_KEY_ALIAS >> android/key.properties
-    - echo keyPassword=$ANDROID_KEY_PASSWORD >> android/key.properties
-    # build flutter app
-    - flutter packages get
-    - flutter clean
-    - flutter build apk --release
-    # prepare artifact
+    # # Flutter local configuration
+    # - echo flutter.sdk=$FLUTTER_PATH > android/local.properties
+    # - echo sdk.dir=$ANDROID_SDK_PATH >> android/local.properties
+    # - echo flutter.buildMode=release >> android/local.properties
+    # # Android signing
+    # - echo "$ANDROID_KEYSTORE_FILE" | base64 -d > android/app/my.keystore
+    # - echo storeFile=my.keystore > android/key.properties
+    # - echo storePassword=$ANDROID_KEYSTORE_PASSWORD >> android/key.properties
+    # - echo keyAlias=$ANDROID_KEY_ALIAS >> android/key.properties
+    # - echo keyPassword=$ANDROID_KEY_PASSWORD >> android/key.properties
+    # # build flutter app
+    # - flutter packages get
+    # - flutter clean
+    # - flutter build apk --release
+    # # prepare artifact
     - find . -name "*.apk" # where is my apk?
-  artifacts:
-    paths:
-      - build/app/outputs/apk/release
-    expire_in: 1 week
-  interruptible: true
+  # artifacts:
+  #   paths:
+  #     - build/app/outputs/apk/release
+  #   expire_in: 1 week
+  # interruptible: true
+
+application:release:
+  stage: release
+  image:
+    name: alpine/git
+    entrypoint: [""]
+  # only:
+  #   - master
+  dependencies:
+    - android:build-release
+  script:
+    - git config user.email "${GITLAB_USER_EMAIL}"
+    - git config user.name "${GITLAB_USER_NAME}"
+    - git remote remove origin
+    - git remote add release-tag-origin https://oauth2:${GITLAB_ACCESS_TOKEN}@${CI_SERVER_HOST}/${CI_PROJECT_PATH}
+    - VERSION_FILE="$(find . -name 'gradle.properties' | head -n1)"
+    - VERSION_NAME="$(grep '^app.versionName=' "${VERSION_FILE}" | cut -d'=' -f2)"
+    - VERSION_CODE="$(grep '^app.versionCode=' "${VERSION_FILE}" | cut -d'=' -f2)"
+    - TAG_NAME="Release_${VERSION_CODE}_${VERSION_NAME}"
+    - echo "${TAG_NAME}"
+    - git tag -a "Release_${TAG_NAME}" -m "Auto-Release ${VERSION_NAME} (${VERSION_CODE})"
+    - git push release-tag-origin "Release_${TAG_NAME}"
 
 android:deploy:
   stage: deploy
   only:
-    - master
+    - tags
   dependencies:
-    - android:build-release
+    - application:release
   script:
     - wget ${REPOSITORY_UPDATE_WEBHOOK}?token=${REPOSITORY_TOKEN}

android/gradle.properties

 org.gradle.jvmargs=-Xmx1536M
 android.useAndroidX=true
 android.enableJetifier=true
-app.versionName=1.0.1
-app.versionCode=2
+app.versionName=1.0.2
+app.versionCode=3