update: ci.yaml (#49)

- 중복 스텝 삭제

Author: josworks27

.github/workflows/ci.yaml

@@ -1,12 +1,8 @@
 name: ci
 on:
-  push:
-    branches:
-      - main
   pull_request:
     branches:
       - main
-
 jobs:
   ci:
     runs-on: ubuntu-latest
@@ -19,19 +15,9 @@ jobs:
         with:
           node-version: 16.x
           cache: yarn
-      - name: Install dependencies
+      - name: Dependency installation
         run: yarn install --frozen-lockfile
-      - name: Lint
-        run: yarn lint
-      - name: Type check
-        run: yarn type-check
-        
-
-      - name: Install dependencies
-        run: yarn install
-
       - name: Lint check
         run: yarn lint
-
       - name: Type check
-        run: yarn type-check
+        run: yarn type-check