ci: fetch all history and tags before building

This avoid the output "fatal: No names found, cannot describe anything" caused by `git describe --tags` in the Makefile.

Author: buchdag

.github/workflows/tests.yml

@@ -21,6 +21,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
 
       - uses: actions/setup-go@v2
         with: