Add GitHub Actions for hello and secret token

.github/workflows/hello.yml

@@ -0,0 +1,10 @@
+name: Hello
+
+on: [push]
+
+jobs:
+  say-hello:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Say hello
+        run: echo "hello"

.github/workflows/secret.yml

@@ -0,0 +1,13 @@
+name: Use Secret Token
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use secret in env
+        run: echo "The secret is $MY_SECRET_TOKEN"
+        env:
+          MY_SECRET_TOKEN: ${{ secrets.MY_SECRET_TOKEN }}