ci: add burn and test script (for local ci)

.github/workflows/burn_test.yml

@@ -0,0 +1,22 @@
+name: mkimg-th1520-test
+
+on:
+  workflow_run:
+    workflows: ["mkimg-th1520-ci"]
+    types: 
+      - completed
+
+jobs:
+  download:
+    runs-on: ["ubuntu-latest"]
+    steps:
+      - name: 'Download artifact'
+        uses: actions/download-artifact@v4
+      - name: 'List all downloaded files'
+        run: ls -R $GITHUB_WORKSPACE
+      - name: 'Decompress artifact'
+        run: | 
+          unzip th1520-lpi4a-*.zip
+          zstd -d ./*.zst
+      - name: 'List all downloaded files'
+        run: ls -R $GITHUB_WORKSPACE