ci: remove Docker build from release workflow

Docker image builds are too large and slow. Keep only cross-platform
binary builds and checksums in the release pipeline.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gcmsg

.github/workflows/release.yaml

@@ -7,7 +7,6 @@ on:
 
 permissions:
   contents: write
-  packages: write
 
 jobs:
   build:
@@ -81,32 +80,3 @@ jobs:
             peerclawd-*
             checksums.txt
           generate_release_notes: true
-
-  docker:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Extract version
-        id: version
-        run: echo "tag=${GITHUB_REF#refs/tags/}" >> "$GITHUB_OUTPUT"
-
-      - name: Build and push
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          push: true
-          platforms: linux/amd64,linux/arm64
-          tags: |
-            ghcr.io/${{ github.repository }}:${{ steps.version.outputs.tag }}
-            ghcr.io/${{ github.repository }}:latest