Change checkout ref to use github.ref

Author: AnastaZIuk

.github/workflows/main.yml

@@ -156,7 +156,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
         with:
-          ref: ${{ github.event.inputs.COMMIT_SHA }}
+          ref: ${{ github.ref }}
           fetch-depth: 1
           sparse-checkout: |
             unittests
@@ -183,4 +183,4 @@ jobs:
         run: |
           ctest -C ${{ matrix.configuration }} -VV -R dxc_smoke --output-on-failure
         working-directory: unittests\Devsh\build
-        shell: cmd
+        shell: cmd