ci: add gitea build and docker publish workflows

.dockerignore

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+.git
+.gitea
+node_modules
+dist
+npm-debug.log*
+.env
+.env.*

.gitea/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build-frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: npm
+
+      - name: Install deps
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Validate lobby server syntax
+        run: node --check server/lobby.js

.gitea/workflows/docker-publish.yml

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+name: Docker Publish
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+env:
+  REGISTRY: gitea.theriise.net
+  IMAGE_WEB: gitea.theriise.net/steinhelge/pong-web
+  IMAGE_LOBBY: gitea.theriise.net/steinhelge/pong-lobby
+
+jobs:
+  publish-images:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set image tags
+        id: meta
+        shell: bash
+        run: |
+          short_sha="$(git rev-parse --short=12 HEAD)"
+          echo "short_sha=$short_sha" >> "$GITHUB_OUTPUT"
+          if tag_name="$(git describe --tags --exact-match 2>/dev/null)"; then
+            echo "version_tag=$tag_name" >> "$GITHUB_OUTPUT"
+          else
+            echo "version_tag=sha-$short_sha" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Login to registry
+        shell: bash
+        env:
+          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
+          REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
+        run: |
+          test -n "$REGISTRY_USER"
+          test -n "$REGISTRY_PASSWORD"
+          echo "$REGISTRY_PASSWORD" | docker login "$REGISTRY" -u "$REGISTRY_USER" --password-stdin
+
+      - name: Build and push web image
+        shell: bash
+        run: |
+          docker build \
+            -f Dockerfile \
+            -t "$IMAGE_WEB:${{ steps.meta.outputs.version_tag }}" \
+            -t "$IMAGE_WEB:latest" \
+            .
+          docker push "$IMAGE_WEB:${{ steps.meta.outputs.version_tag }}"
+          docker push "$IMAGE_WEB:latest"
+
+      - name: Build and push lobby image
+        shell: bash
+        run: |
+          docker build \
+            -f Dockerfile.lobby \
+            -t "$IMAGE_LOBBY:${{ steps.meta.outputs.version_tag }}" \
+            -t "$IMAGE_LOBBY:latest" \
+            .
+          docker push "$IMAGE_LOBBY:${{ steps.meta.outputs.version_tag }}"
+          docker push "$IMAGE_LOBBY:latest"