diff --git a/.github/workflows/docker-release.yml b/.github/workflows/docker-release.yml
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+name: Docker release
+
+# Builds and publishes a multi-arch (linux/amd64 + linux/arm64) Docker
+# image whenever a version tag (e.g. "v1.2.3") is pushed, or a release is
+# published for one. Written against the GitHub Actions syntax, which
+# Gitea Actions runs unmodified — the ${{ github.* }} context and
+# secrets.GITHUB_TOKEN are provided as compatibility aliases by Gitea's
+# act runner, so this workflow works as-is on either platform.
+#
+# The image is pushed to this server's own container registry, addressed
+# as "<host>/<owner>/<repo>" (e.g. git.example.com/owner/nidus on Gitea,
+# or ghcr.io/owner/nidus if this repo is ever mirrored to GitHub).
+
+on:
+  push:
+    tags:
+      - "v*"
+  release:
+    types: [published]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Determine registry, image name, and tags
+        id: vars
+        run: |
+          registry="$(echo "${{ github.server_url }}" | sed -E 's#^https?://##')"
+          image_name="$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')"
+          image="${registry}/${image_name}"
+          version="${GITHUB_REF_NAME#v}"
+
+          {
+            echo "registry=${registry}"
+            echo "image=${image}"
+            echo "tags=${image}:${version},${image}:latest"
+          } >> "$GITHUB_OUTPUT"
+
+      - 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 the container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ steps.vars.outputs.registry }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.vars.outputs.tags }}