Publish main builds to once-campfire-edge and releases from the release environment

.github/workflows/publish-image.yml

@@ -41,7 +41,9 @@ jobs:
             arch: arm64
     env:
       REGISTRY: ghcr.io
-      IMAGE_NAME: ${{ github.repository }}
+      # Per-arch images always go to <repo>-edge, with this repository's own token;
+      # the release package receives them only through the manifest job below.
+      IMAGE_NAME: ${{ github.repository }}-edge
     steps:
       - name: Checkout
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
@@ -128,6 +130,7 @@ jobs:
     name: Create multi-arch manifest and sign
     needs: build
     if: github.event_name != 'pull_request'
+    environment: ${{ startsWith(github.ref, 'refs/tags/v') && 'release' || 'edge' }}
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -136,7 +139,8 @@ jobs:
     timeout-minutes: 20
     env:
       REGISTRY: ghcr.io
-      IMAGE_NAME: ${{ github.repository }}
+      IMAGE_NAME: ${{ startsWith(github.ref, 'refs/tags/v') && github.repository || format('{0}-edge', github.repository) }}
+      EDGE_IMAGE_NAME: ${{ github.repository }}-edge
     steps:
       - name: Set up Docker Buildx (for imagetools)
         uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1
@@ -145,8 +149,12 @@ jobs:
         uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          # GHCR_PUBLISH_TOKEN (classic PAT, write:packages, machine user) exists only in
+          # the `release` environment. Once the release package's Actions access is locked
+          # to read, this repository's GITHUB_TOKEN cannot push to it; until then the
+          # fallback keeps releases working.
+          username: ${{ secrets.GHCR_PUBLISH_TOKEN && vars.GHCR_PUBLISH_USER || github.actor }}
+          password: ${{ secrets.GHCR_PUBLISH_TOKEN || secrets.GITHUB_TOKEN }}
 
       - name: Compute canonical image name (lowercase)
         id: vars
@@ -192,6 +200,8 @@ jobs:
               ref="${GITHUB_REF#refs/tags/}"
               src_tag="${tag%:latest}:$ref"
             fi
+            # The per-arch sources always live in the edge package.
+            src_tag="${REGISTRY}/${EDGE_IMAGE_NAME,,}:${src_tag##*:}"
             if [ -n "${IMAGE_DESCRIPTION:-}" ]; then
               docker buildx imagetools create \
                 --tag "$tag" \