[BWA-33]: Download Play Store credentials from Azure blob storage

Downloads the `authenticator_play_store-creds.json` file from Azure blob storage and uses it for publishing to the Google Play Store.

This change separates the credentials used for Play Store publishing from the Firebase credentials.

.github/workflows/build.yml

@@ -137,6 +137,9 @@ jobs:
 
           az storage blob download --account-name $ACCOUNT_NAME --container-name $CONTAINER_NAME \
           --name authenticator_play_firebase-creds.json --file ${{ github.workspace }}/secrets/authenticator_play_firebase-creds.json --output none
+          
+          az storage blob download --account-name $ACCOUNT_NAME --container-name $CONTAINER_NAME \
+          --name authenticator_play_store-creds.json --file ${{ github.workspace }}/secrets/authenticator_play_store-creds.json --output none
 
       - name: Validate Gradle wrapper
         uses: gradle/actions/wrapper-validation@cc4fc85e6b35bafd578d5ffbc76a5518407e1af0 # v4.2.1
@@ -250,12 +253,17 @@ jobs:
           bundle exec fastlane distributeReleaseBundleToFirebase \
           serviceCredentialsFile:${{ env.FIREBASE_CREDS_PATH }}
 
+      - name: Verify Play Store credentials
+        if: ${{ matrix.variant == 'aab' && inputs.publish-to-play-store }}
+        run: |
+          bundle exec fastlane run validate_play_store_json_key
+
       # Only publish bundles to Play Store when `publish-to-play-store` is true while building
       # bundles
       - name: Publish release bundle to Google Play Store
         if: ${{ inputs.publish-to-play-store && matrix.variant == 'aab' }}
         env:
-          PLAY_STORE_CREDS_FILE: ${{ github.workspace }}/secrets/authenticator_play_firebase-creds.json
+          PLAY_STORE_CREDS_FILE: ${{ github.workspace }}/secrets/authenticator_play_store-creds.json
         run: |
           bundle exec fastlane publishReleaseToGooglePlayStore \
           serviceCredentialsFile:${{ env.PLAY_STORE_CREDS_FILE }} \