gradle.yml: Add dos2unix installation

Author: zhenglong1603

.github/workflows/gradle.yml

@@ -34,18 +34,21 @@ jobs:
       - name: Build and check with Gradle
         run: ./gradlew check
 
-      - name: Perform IO redirection test (*NIX)
+      - name: Install dos2unix on Linux
         if: runner.os == 'Linux'
-        working-directory:  ${{ github.workspace }}/text-ui-test
-        run: ./runtest.sh
+        run: sudo apt-get update && sudo apt-get install -y dos2unix
+
+      - name: Install dos2unix on macOS
+        if: runner.os == 'macOS'
+        run: brew install dos2unix
 
-      - name: Perform IO redirection test (MacOS)
-        if: always() && runner.os == 'macOS'
-        working-directory:  ${{ github.workspace }}/text-ui-test
+      - name: Perform IO redirection test (*NIX or macOS)
+        if: runner.os == 'Linux' || runner.os == 'macOS'
+        working-directory: ${{ github.workspace }}/text-ui-test
         run: ./runtest.sh
 
       - name: Perform IO redirection test (Windows)
         if: always() && runner.os == 'Windows'
-        working-directory:  ${{ github.workspace }}/text-ui-test
+        working-directory: ${{ github.workspace }}/text-ui-test
         shell: cmd
         run: runtest.bat