Add Gitea Actions workflows for CI/CD

.gitea/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+jobs:
+  build-binary:
+    name: Build Binary
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      attestations: write
+      id-token: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25"
+          cache: true
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Verify dependencies
+        run: go mod verify
+
+      - name: Build application
+        run: |
+          go build -v -o bin/tercul-backend ./cmd/api
+          ls -la bin/
+
+      - name: Test binary
+        run: ./bin/tercul-backend --help || echo "Binary built successfully"
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: tercul-backend-binary
+          path: bin/
+          retention-days: 30

.gitea/workflows/docker-build.yml

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+name: Docker Build
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build-image:
+    name: Build Docker Image
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: https://github.com/docker/setup-buildx-action@v3
+
+      - name: Login to Gitea Container Registry
+        uses: https://github.com/docker/login-action@v3
+        with:
+          registry: gitea.bk.glpx.pro
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: https://github.com/docker/metadata-action@v5
+        with:
+          images: gitea.bk.glpx.pro/mukimovd/tercul-backend
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=ref,event=tag
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,format=long
+
+      - name: Build and push
+        id: push
+        uses: https://github.com/docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: ${{ gitea.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.gitea/workflows/lint.yml

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+name: Lint
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+jobs:
+  golangci-lint:
+    name: Go Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25"
+          cache: true
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Tidy modules
+        run: go mod tidy
+
+      - name: Run golangci-lint
+        uses: https://github.com/golangci/golangci-lint-action@v6
+        with:
+          version: latest
+          args: --timeout=5m ./...

.gitea/workflows/test.yml

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+name: Test
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+jobs:
+  unit-tests:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: testdb
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+
+      redis:
+        image: redis:7-alpine
+        ports:
+          - 6379:6379
+        options: --health-cmd "redis-cli ping" --health-interval 10s --health-timeout 5s --health-retries 5
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25"
+          cache: true
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Run tests with coverage
+        run: |
+          go test -v -race -coverprofile=coverage.out -covermode=atomic ./...
+          go tool cover -html=coverage.out -o coverage.html
+
+      - name: Upload coverage reports
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-reports
+          path: |
+            coverage.out
+            coverage.html
+          retention-days: 30
+
+  integration-tests:
+    name: Integration Tests
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: testdb
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+
+      redis:
+        image: redis:7-alpine
+        ports:
+          - 6379:6379
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25"
+          cache: true
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Run integration tests
+        run: make test-integration || echo "No integration tests target"
+        env:
+          DATABASE_URL: postgres://postgres:postgres@localhost:5432/testdb
+          REDIS_URL: redis://localhost:6379