ci: Add workflow to build and push docker image

Author: xendarboh

.github/workflows/docker.yml

@@ -0,0 +1,102 @@
+name: Build and Push Appchain-Agent Docker Image
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+    paths:
+      - ".github/workflows/docker.yml"
+    tags:
+      - "v*"
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-push-docker-image:
+    runs-on: ubuntu-latest
+
+    env:
+      APPCHAIN_REF: main
+      APPCHAIN_REPO: ${{ github.repository_owner }}/appchain
+      IMAGE: ghcr.io/${{ github.repository_owner }}/appchain-agent
+      IMAGE_TEST: zkn/appchain-agent
+
+    steps:
+      - name: Checkout appchain-agent repository
+        uses: actions/checkout@v4
+        with:
+          path: appchain-agent
+
+      - name: Checkout appchain repository
+        uses: actions/checkout@v4
+        with:
+          path: appchain
+          ref: ${{ env.APPCHAIN_REF }}
+          repository: ${{ env.APPCHAIN_REPO }}
+          ssh-key: ${{ secrets.APPCHAIN_DEPLOY_KEY }}
+
+      - 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 GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.IMAGE }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=sha
+
+      # https://docs.docker.com/build/ci/github-actions/reproducible-builds/
+      - name: Set source build date from git commit timestamp
+        run: echo "SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)" >> $GITHUB_ENV
+
+      - name: Build and export to Docker
+        uses: docker/build-push-action@v6
+        env:
+          DOCKER_BUILD_SUMMARY: false
+        with:
+          build-contexts: |
+            context-appchain=./appchain
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          context: ./appchain-agent
+          tags: ${{ env.IMAGE_TEST }}:test
+          load: true
+
+      - name: Test docker image
+        run: docker run --rm ${{ env.IMAGE_TEST }}:test pnpm run agent --help
+
+      - name: Docker build and push
+        uses: docker/build-push-action@v6
+        with:
+          build-contexts: |
+            context-appchain=./appchain
+          context: ./appchain-agent
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64
+          push: ${{ github.event_name != 'pull_request' }}
+
+      - name: List docker images
+        run: docker images