ci: reduce git-fetch depth to 1

Signed-off-by: Sebastien Binet <binet@cern.ch>

Author: sbinet

.github/workflows/ci.yml

@@ -35,6 +35,8 @@ jobs:
 
     - name: Checkout code
       uses: actions/checkout@v2
+      with:
+        fetch-depth: 1
 
     - name: Cache-Go
       uses: actions/cache@v1