ci: remove skipci job

.github/workflows/test.yml

@@ -11,20 +11,8 @@ on:
       - '*.md'
 
 jobs:
-  skipci:
-    runs-on: ubuntu-18.04
-    outputs:
-      is_skip: ${{ steps.is_skip.outputs.is_skip }}
-    steps:
-      - name: Set is_skip
-        id: is_skip
-        run: echo "::set-output name=is_skip::${{ contains(github.event.head_commit.message, '[skip ci]') }}"
-      - run: echo "[skip ci] ${{ steps.is_skip.outputs.is_skip }}"
-
   test:
     runs-on: ${{ matrix.os }}
-    needs: skipci
-    if: ${{ ! needs.skipci.outputs.is_skip }}
     strategy:
       matrix:
         os: