CI: Create binary name from env variables

Author: ad-si

Diff for: .github/workflows/ci.yaml

@@ -60,4 +60,4 @@ jobs:
         uses: actions/upload-artifact@v2
         with:
           path: ~/.local/bin/sqlitedav
-          name: sqlitedav_${{ matrix.os }}_x86_64
+          name: sqlitedav_$RUNNER_OS_$RUNNER_ARCH