build: add support for go 1.18

adding support for go 1.18 but rook master still
build on 1.17.

Signed-off-by: subhamkrai <srai@redhat.com>

.github/workflows/build.yml

@@ -74,7 +74,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: ["1.17"]
+        go-version: ["1.17", "1.18"]
     steps:
     - name: checkout
       uses: actions/checkout@v2