fix: devcontainer 실행 이후에 onCreateCommand로 설정

- initializeCommand는 빌드 이전에 실행되어 go 사용 불가능
- 컨테이너 시작 첫번째 단계에서 필요한 설정 적용

.devcontainer/devcontainer.json

@@ -1,10 +1,11 @@
 {
   "name": "iris-devcontainer",
-  "dockerComposeFile": ["docker-compose.yml"],
+  "dockerComposeFile": [
+    "docker-compose.yml"
+  ],
   "service": "iris-dev",
   "workspaceFolder": "/app/src",
-  "initializeCommand": "go install -v golang.org/x/tools/gopls@latest; go install -v github.com/ramya-rao-a/go-outline@latest",
-  "postCreateCommand": "git config --global --add safe.directory /app/src",
+  "onCreateCommand": "go get -d && go install -v golang.org/x/tools/gopls@latest && go install -v github.com/ramya-rao-a/go-outline@latest && git config --global --add safe.directory /app/src",
   "customizations": {
     // Configure properties specific to VS Code.
     "vscode": {
@@ -18,4 +19,4 @@
       ]
     }
   }
-}
+}

Dockerfile-dev

@@ -38,6 +38,4 @@ ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
 RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && chmod -R 777 "$GOPATH"
 
 WORKDIR $GOPATH/src
-COPY . .
-RUN go get -d
 ENV APP_ENV=development