chore: update golang container and add sshd server setup step to jobs…

… section

- Update the golang container to version `1.20-alpine`
- Add a `setup sshd server` step to the `jobs` section

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

.github/workflows/lint.yml

@@ -27,11 +27,15 @@ jobs:
 
   testing:
     runs-on: ubuntu-latest
-    container: golang:1.19-alpine
+    container: golang:1.20-alpine
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
 
+      - name: setup sshd server
+        run: |
+          apk add make
+
       - name: testing
         run: |
           make test