Shellcheck: workflow and minor fix

.github/workflows/shellcheck.yml

@@ -0,0 +1,23 @@
+---
+name: Shellcheck
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  shellcheck:
+    name: Check shell scripts
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          sudo apt update && sudo apt install -y shellcheck
+      - name: shellcheck
+        run: |
+          git grep -l '^#\( *shellcheck \|!\(/bin/\|/usr/bin/env \)\(sh\|bash\|dash\|ksh\)\)' | xargs shellcheck 

package-macos.sh

@@ -6,8 +6,8 @@ cp -r target/jfx/native/datavyu.app target/jfx/native/Datavyu/
 ln -s /Applications target/jfx/native/Datavyu/
 
 echo version number:
-read version
+read -r version
 
-sudo hdiutil create -fs HFS+ target/jfx/native/Datavyu-$version-OSX.dmg -volname "Datavyu" -srcfolder target/jfx/native/Datavyu
+sudo hdiutil create -fs HFS+ "target/jfx/native/Datavyu-$version-OSX.dmg" -volname "Datavyu" -srcfolder target/jfx/native/Datavyu
 
 rm -rf target/jfx/native/Datavyu