separate iverilog install and clone

.github/workflows/run_all_tests.yml

@@ -1,13 +1,19 @@
 name: run_all_tests
 on: [push]
 jobs:
-  install-iverilog:
+  clone-iverilog:
     runs-on: ubuntu-latest
     steps:
       - run: sudo apt install bison flex g++ gcc
       - run: git clone https://github.com/steveicarus/iverilog.git
-      - run: cd iverilog/
-      - run: ls -lai
+
+  install-iverilog:
+    runs-on: ubuntu-latest
+    needs: clone-iverilog
+    defaults:
+      run:
+        working_directory: iverilog
+    steps:
       - run: sh ./autoconf.sh
       - run: ./configure
       - run: make