updating lesson

.github/workflows/dependent_jobs.yaml

@@ -0,0 +1,19 @@
+name:  dependent jobs
+on:  [push]
+jobs:
+  fake_build:
+    runs-on: ubuntu-latest
+    steps:
+      - run:  |
+          echo "Fake build"
+          sleep 10
+        name:  Fake build
+
+  fake_test:
+    runs-on: ubuntu-latest
+    needs:  fake_build
+    steps:
+      - run:  |
+          echo "Fake test"
+          sleep 10
+        name:  Fake test

.github/workflows/hello_mumm.yaml

@@ -1,5 +1,5 @@
 name:  first test
-on:  [workflow_dispatch, push, pull_request, issues]
+on:  [workflow_dispatch]
 jobs:  
   first_hello_mumm:
     runs-on: ubuntu-latest