thodg/libgit2

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9798785..da3acb8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,10 +13,11 @@ jobs:
     steps:
     - name: Check out repository
       uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
     - name: Calculate image label
       run: |
-        cd azure-pipelines/docker && git log -1 -- ./
-        echo "::set-env name=docker-label::libgit2-$(git log -1 --pretty=format:"%h" -- azure-pipelines/docker/\*)"
+        echo "::set-env name=docker-label::libgit2-$(git log -1 --pretty=format:"%h" -- azure-pipelines/docker)"
       env:
         GIT_TRACE: 1
 #    - name: Log in to GitHub Packages