feat: added backend ci pipeline and readme for pipelines

.gitea/README.md

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+# Gitea Actions for Vibing Project
+
+This directory contains Gitea Actions workflows for the Vibing project (both frontend and backend).
+
+## Workflows
+
+### Backend CI (`backend-ci.yml`)
+
+Runs Maven tests on the backend project.
+
+**Triggers:**
+- Push to `main` or `develop` branches
+- Pull requests to `main` or `develop` branches
+- Only when changes are made to files in the `backend/` directory
+
+**What it does:**
+1. Checks out the code
+2. Sets up Java 21 (Temurin distribution)
+3. Caches Maven dependencies for faster builds
+4. Runs `mvn test` in the backend directory
+5. Uploads test results as artifacts (retained for 7 days)
+
+**Requirements:**
+- Java 21
+- Maven
+- Ubuntu runner
+
+### Frontend CI (`frontend-ci.yml`)
+
+Runs linting and builds the frontend project.
+
+**Triggers:**
+- Push to `main` or `develop` branches
+- Pull requests to `main` or `develop` branches
+- Only when changes are made to files in the `frontend/` directory
+
+**What it does:**
+1. Checks out the code
+2. Sets up Node.js 18
+3. Caches npm dependencies for faster builds
+4. Installs dependencies with `npm ci`
+5. Runs ESLint for code quality checks
+6. Builds the project with `npm run build`
+7. Uploads build artifacts (retained for 7 days)
+
+**Requirements:**
+- Node.js 18
+- npm
+- Ubuntu runner

.gitea/workflows/backend-ci.yml

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+name: Backend CI
+
+on:
+  push:
+    branches: [ main, develop ]
+    paths:
+      - 'backend/**'
+  pull_request:
+    branches: [ main, develop ]
+    paths:
+      - 'backend/**'
+
+jobs:
+  test:
+    name: Run Maven Tests
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      
+    - name: Set up JDK 21
+      uses: actions/setup-java@v4
+      with:
+        java-version: '21'
+        distribution: 'temurin'
+        cache: 'maven'
+        
+    - name: Cache Maven packages
+      uses: actions/cache@v3
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2
+        
+    - name: Run Maven tests
+      working-directory: ./backend
+      run: mvn test
+      
+    - name: Upload test results
+      uses: actions/upload-artifact@v3
+      if: always()
+      with:
+        name: backend-test-results
+        path: backend/target/surefire-reports/
+        retention-days: 7