Run strip-nondeterminism on tar.gz builds

Author: GarboMuffin

.github/workflows/build.yml

@@ -29,6 +29,10 @@ jobs:
         node release-automation/build.js --debian --tarball --appimage --x64 --armv7l --arm64
       env:
         DEBUG: electron-builder
+    - name: Normalize tarballs for reproducibility
+      run: |
+        sudo apt-get install -y strip-nondeterminism
+        strip-nondeterminism dist/*.tar.gz
     - name: Debug info
       run: node scripts/print-file-tree.js dist
     - name: Upload artifacts to GitHub Actions