Add cache test

.gitea/workflows/demo.yaml

@@ -4,7 +4,7 @@ on: [push]
 
 jobs:
   Explore-Gitea-Actions:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ gitea.event_name }} event."
       - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by Gitea!"
@@ -16,4 +16,18 @@ jobs:
       - name: List files in the repository
         run: |
           ls ${{ gitea.workspace }}
+      - name: Set up cache
+        uses: actions/cache@v3
+        with:
+          path: magic-data.txt
+          key: ${{ runner.os }}-magic
+      - name: Check or make magic
+        run: |
+          if [ -f magic-data.txt ]; then
+            echo existing magic
+            cat magic-data.txt
+          else
+            echo creating magic
+            echo "$(date)" > magic-data.txt
+          fi
       - run: echo "🍏 This job's status is ${{ job.status }}."