ci(pr-build): revert "sign apk with keystore (#1231)"

This reverts commit 8bf08ff, as it fails for PRs originating from forks

.github/workflows/pr-build.yml

@@ -37,26 +37,9 @@ jobs:
       - name: Build with Flutter
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          SIGNING_KEY_ALIAS: ${{ secrets.SIGNING_KEY_ALIAS }}
-          SIGNING_KEY_PASSWORD: ${{ secrets.SIGNING_KEY_PASSWORD }}
-          SIGNING_STORE_PASSWORD: ${{ secrets.SIGNING_KEYSTORE_PASSWORD }}
         run: flutter build apk --debug
-      - name: Sign APK
-        id: sign_apk
-        uses: ilharp/sign-android-release@v1
-        with:
-          releaseDir: build/app/outputs/apk/debug
-          signingKey: ${{ secrets.SIGNING_KEYSTORE }}
-          keyStorePassword: ${{ secrets.SIGNING_KEYSTORE_PASSWORD }}
-          keyAlias: ${{ secrets.SIGNING_KEY_ALIAS }}
-          keyPassword: ${{ secrets.SIGNING_KEY_PASSWORD }}
-      - name: Get SHA short
-        id: vars
-        run: echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
-      - name: Add version to APK
-        run: mv ${{ steps.sign_apk.outputs.signedFile }} revanced-manager-debug-${{ steps.vars.outputs.sha_short }}.apk
       - name: Upload build
         uses: actions/upload-artifact@v3
         with:
           name: revanced-manager
-          path: revanced-manager-debug-${{ steps.vars.outputs.sha_short }}.apk
+          path: build/app/outputs/flutter-apk/app-debug.apk