Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -0,0 +1,12 @@
+image: ubuntu
+stages:
+  - test
+
+
+testbench:   # This job runs in the test stage.
+  stage: test    # It only starts when the job in the build stage completes successfully.
+  script:
+    - echo "Installing dependencies..."
+    - apt update && apt install -y iverilog yosys verilator gtkwave
+    - echo "Running unit tests..."
+    - make