work around more github action silliness [rebuild]

.github/workflows/main.yml

@@ -34,7 +34,7 @@ jobs:
         uses: actions/upload-artifact@v1
         with:
           name: abst_mac
-          path: abst_mac
+          path: abst_mac.zip
   build-linux:
     runs-on: ubuntu-latest
     if: "contains(github.event.head_commit.message, '[rebuild]')"
@@ -51,4 +51,4 @@ jobs:
         uses: actions/upload-artifact@v1
         with:
           name: abst_linux
-          path: abst_linux
+          path: abst_linux.zip

release/build.sh

@@ -20,4 +20,7 @@ mkdir $output/game
 cp $binary $output/game
 cp -Rv game/assets $output/game
 
-rm -f release_data.zip
+# TODO Github will double-zip this, but if we just pass the directory, then the
+# chmod +x bits get lost
+zip -r $output $output
+rm -f release_data.zip $output