ci-test: Append build Go version to artifact

Also, append ".x" to Go version number matrix to ensure the latest
PATCH version is fetched.

.github/workflows/ci-test.yml

@@ -8,7 +8,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
     strategy:
       matrix:
-        go-version: ['1.15', '1.16', '1.17']
+        go-version: ['1.15.x', '1.16.x', '1.17.x']
     env:
       GO111MODULE: on  # Needed for github.com/google/go-github/v38
 
@@ -48,5 +48,5 @@ jobs:
       - name: Upload dh-make-golang test run as artifact
         uses: actions/upload-artifact@v2
         with:
-          name: dh-make-golang_test-run
+          name: dh-make-golang_test-run_go${{ matrix.go-version }}
           path: _test-run