ci(docker): add docker-publish workflow and clean up release.yml

Add dedicated docker-publish.yml with full CI/CD pipeline:
- Build & push server/agent/web/mcp images on tag, main push, and PR
- Publish to both Docker Hub and GHCR
- Semver tag strategy (latest, version, major.minor, major, sha)
- GHA build cache, SLSA provenance, and SBOM
- PR builds validate without pushing

Remove superseded dockerhub job from release.yml.

.github/workflows/docker-publish.yml

@@ -0,0 +1,93 @@
+name: Docker Publish
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*.*.*"]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+  id-token: write
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - image: server
+            dockerfile: docker/Dockerfile.server
+          - image: agent
+            dockerfile: docker/Dockerfile.agent
+          - image: web
+            dockerfile: docker/Dockerfile.web
+          - image: mcp
+            dockerfile: docker/Dockerfile.mcp
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            memohai/${{ matrix.image }}
+            ghcr.io/${{ github.repository_owner }}/${{ matrix.image }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+          labels: |
+            org.opencontainers.image.title=memoh-${{ matrix.image }}
+            org.opencontainers.image.description=Memoh ${{ matrix.image }} - Multi-member AI agent platform
+            org.opencontainers.image.vendor=memohai
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ${{ matrix.dockerfile }}
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+          build-args: |
+            VERSION=${{ steps.meta.outputs.version }}
+            COMMIT_HASH=${{ github.sha }}
+            BUILD_TIME=${{ fromJson(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
+            VITE_API_URL=/api
+            VITE_AGENT_URL=/agent
+          provenance: true
+          sbom: true
+          cache-from: type=gha,scope=${{ matrix.image }}
+          cache-to: type=gha,scope=${{ matrix.image }},mode=max

.github/workflows/release.yml

@@ -8,13 +8,9 @@ on:
   push:
     tags:
       - 'v*'
-  release:
-    types:
-      - published
 
 jobs:
   release:
-    if: github.event_name == 'push'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -39,47 +35,3 @@ jobs:
       #   env:
       #     NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
       #     NPM_CONFIG_PROVENANCE: true
-
-  dockerhub:
-    if: github.event_name == 'release'
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        include:
-          - image: server
-            dockerfile: docker/Dockerfile.server
-          - image: agent
-            dockerfile: docker/Dockerfile.agent
-          - image: web
-            dockerfile: docker/Dockerfile.web
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set build time
-        id: vars
-        run: echo "build_time=$(date -u +%Y-%m-%dT%H:%M:%SZ)" >> "$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 Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Build and push multi-arch image
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: ${{ matrix.dockerfile }}
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: memohai/${{ matrix.image }}:${{ github.event.release.tag_name }}
-          build-args: |
-            VERSION=${{ github.event.release.tag_name }}
-            COMMIT_HASH=${{ github.sha }}
-            BUILD_TIME=${{ steps.vars.outputs.build_time }}