Added unit tests for text encoding.

Updated the CI scripts.
Clean up libzip files with invalid characters.

.github/workflows/eepp-macos-build-check.yml

@@ -9,6 +9,7 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v3
       with:
+        ref: ${{ github.ref }}
         fetch-depth: 2
     - name: Checkout submodules
       run: |
@@ -20,3 +21,8 @@ jobs:
       run: |
         premake5 gmake2
         make -C make/macosx/ -e config=release_arm64
+    - name: Unit Tests
+      run: |
+        cd bin/unit_tests
+        ./eepp-unit_tests
+