ci: add Gitea Actions workflow to build and publish multi-arch image

Builds linux/amd64+arm64 from source and pushes to the built-in Gitea
container registry (git.qomar.pw/omar/ds2api) on push to main and tags.
Adds --platform=$BUILDPLATFORM to the node/go builder stages so arm64
cross-compiles on the amd64 runner instead of slow QEMU emulation.

.gitea/workflows/build-image.yml

@@ -0,0 +1,67 @@
+name: Build and Publish Image
+
+# Собирает Docker-образ из исходника и пушит в встроенный registry Gitea (Packages).
+# Образ:  git.qomar.pw/omar/ds2api
+# Триггеры: push в main, любой тег vX.Y.Z, и ручной запуск.
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+env:
+  REGISTRY: git.qomar.pw
+  # github.repository в Gitea = "omar/ds2api" (уже в нижнем регистре)
+  IMAGE: git.qomar.pw/${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Gitea registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          # actor — пользователь, запустивший workflow (omar); GITEA_TOKEN выдаётся автоматически
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=sha-
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        env:
+          DOCKER_BUILD_RECORD_UPLOAD: "false"
+          DOCKER_BUILD_SUMMARY: "false"
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            BUILD_VERSION=${{ github.ref_name }}

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:24 AS webui-builder
+FROM --platform=$BUILDPLATFORM node:24 AS webui-builder
 
 WORKDIR /app/webui
 COPY webui/package.json webui/package-lock.json ./
@@ -7,7 +7,7 @@ COPY config.example.json /app/config.example.json
 COPY webui ./
 RUN npm run build
 
-FROM golang:1.26 AS go-builder
+FROM --platform=$BUILDPLATFORM golang:1.26 AS go-builder
 WORKDIR /app
 ARG TARGETOS
 ARG TARGETARCH