checkout to use locally defined action

Author: andnorda

.github/workflows/post-log-to-slack.yml

@@ -8,9 +8,14 @@ jobs:
     runs-on: ubuntu-latest
     name: A job to say hello
     steps:
+      - name: Checkout actions
+        uses: actions/checkout@v3
+        with:
+          sparse-checkout: .github/actions
+          path: actions
       - name: Hello world action step
         id: hello
-        uses: actions/post-log-to-slack
+        uses: ./.github/actions/post-log-to-slack
         with:
           who-to-greet: "Mona the Octocat"
       # Use the output from the `hello` step