And Gradle needs to know where it is

.github/workflows/build_and_deploy.yml

@@ -33,9 +33,10 @@ jobs:
           fileName: "release.jks"
           encodedString: ${{ secrets.KEYSTORE_FILE }}
 
-      - name: Add signing configs to build.gradle
+      - name: Prepare Gradle environment
         run: >
           echo "apply from: 'ci_signing.gradle'" >> mastodon/build.gradle
+          echo "sdk.dir=$ANDROID_SDK_ROOT" > local.properties
 
       - name: Build and deploy to Google Play
         run: bundle exec fastlane deploy