ci: reduce git-checkout depth

Author: sbinet

.github/workflows/ci.yml

@@ -45,6 +45,8 @@ jobs:
 
     - name: Checkout code
       uses: actions/checkout@v2
+      with:
+        fetch-depth: 1
 
     - name: Cache-Go
       uses: actions/cache@v1

.github/workflows/lint.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
       - name: cgo deps
         run:  |
           sudo apt-get update