ci: fix mssql docker service starting failed

.github/workflows/ci-main.yml

@@ -32,7 +32,7 @@ env:
 
 jobs:
   code-test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     # Service containers to run with `code-test`
     services:
@@ -113,24 +113,22 @@ jobs:
       # -e MSSQL_USER=root \
       # -e MSSQL_PASSWORD=LoremIpsum86 \
       # loads/mssqldocker:14.0.3391.2
-
-# TODO mssql docker failed, will be enabled later after it is OK in github action.
-#      mssql:
-#        image: loads/mssqldocker:14.0.3391.2
-#        env:
-#          ACCEPT_EULA:    Y
-#          SA_PASSWORD:    LoremIpsum86
-#          MSSQL_DB:       test
-#          MSSQL_USER:     root
-#          MSSQL_PASSWORD: LoremIpsum86
-#        ports:
-#          - 1433:1433
-#        options: >-
-#          --health-cmd="/opt/mssql-tools/bin/sqlcmd -S localhost -U sa -P LoremIpsum86 -l 30 -Q \"SELECT 1\" || exit 1"
-#          --health-start-period 10s
-#          --health-interval 10s
-#          --health-timeout 5s
-#          --health-retries 10
+      mssql:
+        image: loads/mssqldocker:14.0.3391.2
+        env:
+          ACCEPT_EULA:    Y
+          SA_PASSWORD:    LoremIpsum86
+          MSSQL_DB:       test
+          MSSQL_USER:     root
+          MSSQL_PASSWORD: LoremIpsum86
+        ports:
+          - 1433:1433
+        options: >-
+          --health-cmd="/opt/mssql-tools/bin/sqlcmd -S localhost -U sa -P LoremIpsum86 -l 30 -Q \"SELECT 1\" || exit 1"
+          --health-start-period 10s
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 10
 
       # ClickHouse backend server.
       # docker run -d --name clickhouse \