diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
new file mode 100644
index 0000000..a2734e0
--- /dev/null
+++ b/.github/workflows/docker.yml
@@ -0,0 +1,87 @@
+name: Docker image
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "v*"
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: docker-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref_type != 'tag' }}
+
+env:
+  IMAGE_NAME: ghcr.io/${{ github.repository }}
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Set up Go
+        uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
+        with:
+          go-version-file: go.mod
+          cache: false
+
+      - name: Run tests
+        run: ./scripts/test.sh
+
+  build:
+    name: Build and publish
+    needs: test
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@37fe631027851001ddb9b187196cc803df7f5f0e # v4.3.0
+
+      - name: Log in to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Generate image metadata
+        id: meta
+        uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6.2.0
+        with:
+          images: ${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=sha-
+            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
+
+      - name: Build and push image
+        uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a # v7.3.0
+        with:
+          context: .
+          platforms: linux/amd64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          provenance: mode=max
+          sbom: true
diff --git a/AGENTS.md b/AGENTS.md
index 334244f..edaf7da 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -22,3 +22,4 @@
 - Do not commit SSClash or Mihomo binaries to this repository.
 - The Dockerfile may link to official release URLs and users build the image for their own deployment.
 - Do not publish a prebuilt image containing SSClash without permission from its copyright holder.
+- GitHub Actions may push the amd64 image to private GHCR for this deployment; do not make the package public without that permission.
diff --git a/README.md b/README.md
index dc6476d..5d8dbee 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,19 @@ Versions are pinned in the Dockerfile:
 
 SSClash is verified against the checksum file from its official release. Mihomo amd64 and arm64 archives are verified against pinned SHA-256 values. To update either component, update the version and checksums together, then run the complete test suite.
 
+## GitHub Container Registry
+
+The GitHub Actions workflow builds `linux/amd64` only. SSClash-Go and Mihomo are downloaded and checksum-verified during the Docker build, so the resulting container never downloads executable files at startup.
+
+The workflow runs tests before building, publishes to `ghcr.io/<github-owner>/mohomo-docker`, attaches SBOM and provenance, and creates these tags:
+
+- `latest` and `main` from the default branch;
+- the Git tag and major/minor tags from releases such as `v1.2.3`;
+- an immutable `sha-<commit>` tag;
+- pull-request tags for build validation only, without pushing.
+
+Keep the GHCR package visibility **private**. The workflow deliberately does not attempt to change package visibility. Making an image containing SSClash-Go available to third parties conflicts with the upstream binary license unless the copyright holder grants permission.
+
 ## Tests
 
 ```sh
diff --git a/scripts/test.sh b/scripts/test.sh
index 3513ed9..d82d032 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -4,6 +4,8 @@ set -eu
 project_root=$(CDPATH='' cd -- "$(dirname -- "$0")/.." && pwd)
 cd "$project_root"
 
+./tests/workflow-contract.sh
+
 unformatted=$(gofmt -l cmd internal)
 if [ -n "$unformatted" ]; then
 	echo "Go files require formatting:" >&2
diff --git a/tests/workflow-contract.sh b/tests/workflow-contract.sh
new file mode 100755
index 0000000..05f16f8
--- /dev/null
+++ b/tests/workflow-contract.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+set -eu
+
+workflow=.github/workflows/docker.yml
+test -f "$workflow" || {
+	echo "missing GHCR workflow: $workflow" >&2
+	exit 1
+}
+
+grep -F 'packages: write' "$workflow" >/dev/null
+# Match the GitHub expression literally.
+# shellcheck disable=SC2016
+grep -F 'ghcr.io/${{ github.repository }}' "$workflow" >/dev/null
+grep -F 'platforms: linux/amd64' "$workflow" >/dev/null
+grep -F 'needs: test' "$workflow" >/dev/null
+# Match the GitHub expression literally.
+# shellcheck disable=SC2016
+grep -F 'push: ${{ github.event_name != '\''pull_request'\'' }}' "$workflow" >/dev/null
+
+if grep -Ei 'arm64|setup-qemu' "$workflow" >/dev/null; then
+	echo "workflow must build linux/amd64 only and must not configure QEMU" >&2
+	exit 1
+fi
+
+uses_count=$(grep -Ec '^[[:space:]]+uses:' "$workflow")
+pinned_count=$(grep -Ec '^[[:space:]]+uses: [^ ]+@[0-9a-f]{40}([[:space:]]|$)' "$workflow")
+if [ "$uses_count" -eq 0 ] || [ "$uses_count" -ne "$pinned_count" ]; then
+	echo "every GitHub Action must be pinned to a full commit SHA" >&2
+	exit 1
+fi