chore: Remove gulp dependencies (#557)

Author: jdneo

.github/workflows/linux.yml

@@ -34,9 +34,6 @@ jobs:
     - name: Install Node.js modules
       run: npm install
 
-    - name: Install Gulp
-      run: npm install -g gulp
-
     - name: Install VSCE
       run: npm install -g vsce
 

.github/workflows/linuxUI.yml

@@ -34,9 +34,6 @@ jobs:
     - name: Install Node.js modules
       run: npm install
 
-    - name: Install Gulp
-      run: npm install -g gulp
-
     - name: Install VSCE
       run: npm install -g vsce
 

.github/workflows/macOS.yml

@@ -27,9 +27,6 @@ jobs:
     - name: Install Node.js modules
       run: npm install
 
-    - name: Install Gulp
-      run: npm install -g gulp
-
     - name: Install VSCE
       run: npm install -g vsce
 

.github/workflows/windows.yml

@@ -27,9 +27,6 @@ jobs:
     - name: Install Node.js modules
       run: npm install
 
-    - name: Install Gulp
-      run: npm install -g gulp --force
-
     - name: Install VSCE
       run: npm install -g vsce
 

.github/workflows/windowsUI.yml

@@ -27,17 +27,15 @@ jobs:
     - name: Install Node.js modules
       run: npm install
 
-    - name: Install Gulp
-      run: npm install -g gulp --force
-
     - name: Install VSCE
       run: npm install -g vsce
 
     - name: Lint
-      run: gulp tslint
+      run: npm run tslint
 
     - name: Checkstyle
-      run: gulp checkstyle
+      working-directory: .\jdtls.ext
+      run: .\mvnw.cmd checkstyle:check
 
     - name: Build OSGi bundle
       run: npm run build-server

.vscodeignore

@@ -7,7 +7,7 @@ src/**
 jdtls.ext/**
 vscode/**
 tsconfig.json
-gulpfile.js
+scripts/build/**
 .gitignore
 dist/**/test
 webpack.*.js

README.md

@@ -80,9 +80,8 @@ You can tell that the glob pattern is supported. And here's more - you can  incl
 
 * Go to root folder:
 ```
-npm install -g gulp
 npm install
-gulp build_server
+npm run build-server
 ```
 
 ## Telemetry