Clean up bash scripts

.github/workflows/build.yml

@@ -13,8 +13,11 @@ jobs:
       - name: Update and install packages
         run: |
           dnf -y update
-          dnf -y install pkgconf-pkg-config which cmake make nasm qt6-qtwebsockets-devel hidapi-devel zlib-devel libpng-devel SDL2_net-devel wget zip git
+          dnf -y install pkgconf-pkg-config which cmake make nasm qt6-qtwebsockets-devel hidapi-devel zlib-devel libpng-devel SDL2_net-devel wget zip git ShellCheck
       - uses: actions/checkout@v3
+      - name: Check shell scripts
+        run: |
+          shellcheck build.sh clean.sh link-mac.sh pull_repos.sh
       - name: Run build script
         run: |
           git config --global --add safe.directory /__w/simple64/simple64