diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 498a9064af..2ab402fbc1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -44,6 +44,19 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: DEBUG
+        run: |
+          set -x
+          git version
+          git config -l
+          ls -l ./
+          ls -l impls
+          ls -l impls/c
+          ls -l impls/c/Dockerfile
+          git log -1
+          git log -1 -- impls/c/Dockerfile
+          TZ=UTC git log -1 --pretty=%ad-g%h --date=format-local:"%Y%m%d_%H%M%S"
+          TZ=UTC git log -1 --pretty=%ad-g%h --date=format-local:"%Y%m%d_%H%M%S" -- impls/c/Dockerfile
       - name: Docker Build
         run: |
           export ${{ matrix.IMPL }}