diff --git a/template/.github/workflows/ci.yml b/template/.github/workflows/ci.yml
index 8b3b509..60885c1 100644
--- a/template/.github/workflows/ci.yml
+++ b/template/.github/workflows/ci.yml
@@ -214,6 +214,10 @@ jobs:
     steps:
     - name: Checkout code
       uses: actions/checkout@v4
+      with:
+        # The tag applied to the Docker image we build is based on the number of commits
+        # on the current branch. This is only accurate when you have a _full_ checkout.
+        fetch-depth: 0
 
     - name: Install management tools
       run: pipx install invoke