Fix CI

Author: ChAoSUnItY

.github/workflows/main.yml

@@ -87,9 +87,11 @@ jobs:
         run: |
           make out/shecc
           ./out/shecc-stage1.elf -E src/main.c > ./out/out.c
+          chmod a+x ./out/shecc-stage1.elf
       - name: Build stage 2 artifact
         run: |
           ./out/shecc-stage1.elf --no-libc -o out/shecc-stage2.elf ./out/out.c
+          chmod a+x ./out/shecc-stage2.elf
       - name: Test stage 2 artifact
         run: |
           make check-stage2 || exit 1