add version variable

.gitlab-ci.yml

 stages:
   - build
 
+variables:
+  APPLICATION_VERSION: "1.0.0"
+
 android_build:
   stage: build
   image: 
@@ -35,8 +38,8 @@ apks:
     - android_build
   artifacts:
     paths: # individual apks to reduce artifact size
-      - car-app_arm64_v8a_xhdpi.apk
-      - car-app_x86_64_xhdpi.apk
+      - car-app_${APPLICATION_VERSION}_arm64_v8a_xhdpi.apk
+      - car-app_${APPLICATION_VERSION}_x86_64_xhdpi.apk
     expire_in: 1 day
   script:
     - apk add perl-file-rename --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing/
@@ -44,4 +47,4 @@ apks:
     - java -jar /app/bundletool.jar build-apks --bundle=car_app.aab --output=car_app.apks --ks=keystore.jks --ks-pass=pass:$SIGNING_STORE_PW --ks-key-alias=$SIGNING_KEY_ALIAS --key-pass=pass:$SIGNING_KEY_PW
     - unzip -q car_app.apks -d car_app_apks
     - mv car_app_apks/standalones/*.apk .
-    - file-rename -v 's/standalone-(\w+).*$/car-app_$1.apk/' *.apk
+    - file-rename -v "s/standalone-(\w+).*$/car-app_${APPLICATION_VERSION}_\$1.apk/" *.apk