ci: Fix Sign issue

Follow r0adkll/sign-android-release#84

.github/workflows/build.yml

@@ -37,9 +37,17 @@ jobs:
           sed -i 's/org.gradle.configuration-cache=true//g' gradle.properties
           ./gradlew assembleRelease
 
+      - name: Get Build Tool Version
+        shell: bash
+        run: |
+          BUILD_TOOL_VERSION=$(ls /usr/local/lib/android/sdk/build-tools/ | tail -n 1)
+          echo "BUILD_TOOL_VERSION=$BUILD_TOOL_VERSION" >> $GITHUB_ENV
+          echo Last build tool version is: $BUILD_TOOL_VERSION
+
       - name: Sign Release
         env: 
           SIGNING_KEY: ${{ secrets.SIGNING_KEY }}
+          BUILD_TOOLS_VERSION: ${{ env.BUILD_TOOL_VERSION }}
         if: ${{ env.SIGNING_KEY != '' }}
         continue-on-error: true
         uses: kevin-david/zipalign-sign-android-release@v1
@@ -71,4 +79,4 @@ jobs:
           artifacts: ${{steps.sign_app.outputs.signedReleaseFile}}
           generateReleaseNotes: true
           makeLatest: true
-          replacesArtifacts: true
+          replacesArtifacts: true