ci: unify workflows - split build per component, single tag-triggered pipeline

.gitea/workflows/build_server_core.yaml

@@ -0,0 +1,37 @@
+name: Build Server Core
+
+on:
+  workflow_call:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: apps/server-core
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.26'
+
+      - name: Download Go modules
+        run: go mod download
+
+      - name: Generate Swagger docs
+        run: |
+          go install github.com/swaggo/swag/cmd/swag@v1.16.6
+          swag init -g main.go --parseDependency --parseInternal
+
+      - name: Build
+        run: go build -o bin/server-core .
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: server-core-linux-amd64
+          path: apps/server-core/bin/server-core