feat: add SHELL input support

.github/workflows/ci_cd.yml

@@ -197,6 +197,25 @@ jobs:
           expected: failure
           actual: ${{ steps.sad_path_timeout.outcome }}
 
+      - name: sad-path (wrong shell)
+        id: wrong_shell
+        uses: ./
+        continue-on-error: true
+        with:
+          timeout_minutes: 1
+          max_attempts: 2
+          shell: cmd
+          command: "dir"
+      - uses: nick-invision/assert-action@v1
+        with:
+          expected: 2
+          actual: ${{ steps.wrong_shell.outputs.total_attempts }}
+      - uses: nick-invision/assert-action@v1
+        with:
+          expected: failure
+          actual: ${{ steps.wrong_shell.outcome }}
+
+
   # runs on push to master only
   cd:
     name: Publish Action