ci: read the org-scoped ZEGIT_CI_PACKAGE_TOKEN, not a repo-local name

The publish path failed at registry login on every dispatch (runs 18,
20) because it read `secrets.ZEGIT_PACKAGE_TOKEN`, a name that exists
nowhere. The package-write token every zegit-zoo image workflow uses is
ZEGIT_CI_PACKAGE_TOKEN, held above repository scope, so this repository
can read it under that name — no second token, no second copy to rotate.

.github/workflows/build-image-gitea.yml

@@ -90,11 +90,11 @@ jobs:
       - name: Registry login
         if: ${{ steps.meta.outputs.push == 'true' }}
         env:
-          TOKEN: ${{ secrets.ZEGIT_PACKAGE_TOKEN }}
+          TOKEN: ${{ secrets.ZEGIT_CI_PACKAGE_TOKEN }}
         run: |
           set -euo pipefail
           if [ -z "${TOKEN:-}" ]; then
-            echo "::error::ZEGIT_PACKAGE_TOKEN is not set, so this dispatch would build an image and push nothing. Issue a package-write token and store it as this secret."
+            echo "::error::ZEGIT_CI_PACKAGE_TOKEN is not visible to this run. It is the org-scoped package-write token every zegit-zoo image workflow uses (docs: flux-config docs/rotation/forge-secrets.yaml); this repository must be able to read the org secret, and the name must match."
             exit 1
           fi
           mkdir -p "$HOME/.docker"
@@ -106,17 +106,25 @@ jobs:
         run: |
           set -euo pipefail
           REF="${REGISTRY}/${IMAGE_PATH}:${{ steps.meta.outputs.tag }}"
+          # No --output on a validation run: buildctl v0.32 has no "cacheonly"
+          # exporter (run 16, 2026-09-08: 'exporter "cacheonly" could not be
+          # found'), so every push-triggered validation since this workflow
+          # was added had failed — silently, since nothing depended on it. A
+          # build without an exporter still builds every stage on both arches.
           if [ "${{ steps.meta.outputs.push }}" = "true" ]; then
-            out="type=image,name=${REF},push=true"
+            buildctl build --progress=plain \
+              --frontend dockerfile.v0 \
+              --local context=. \
+              --local dockerfile=. \
+              --opt platform=linux/amd64,linux/arm64 \
+              --output "type=image,name=${REF},push=true"
           else
-            out="type=cacheonly"
+            buildctl build --progress=plain \
+              --frontend dockerfile.v0 \
+              --local context=. \
+              --local dockerfile=. \
+              --opt platform=linux/amd64,linux/arm64
           fi
-          buildctl build --progress=plain \
-            --frontend dockerfile.v0 \
-            --local context=. \
-            --local dockerfile=. \
-            --opt platform=linux/amd64,linux/arm64 \
-            --output "$out"
 
       # The image is a TOOLCHAIN, so "it built" is not the property that matters
       # — "it still contains what the gates shell out to" is. build-image.yml
@@ -142,7 +150,7 @@ jobs:
             echo "FROM ${REF}"
             echo 'RUN set -eu; \'
             echo '    python3 -c "import yaml, sys; print(\"python3+yaml\", sys.version.split()[0])"; \'
-            echo '    for t in gcc node bash make curl tar openssl jq; do \'
+            echo '    for t in gcc node bash make curl tar openssl jq chromium-browser psql; do \'
             echo '      command -v "$t" >/dev/null || { echo "MISSING: $t" >&2; exit 1; }; \'
             echo '      echo "ok: $t"; \'
             echo '    done; \'
@@ -154,8 +162,7 @@ jobs:
             --frontend dockerfile.v0 \
             --local context="$work" \
             --local dockerfile="$work" \
-            --opt platform=linux/amd64,linux/arm64 \
-            --output type=cacheonly
+            --opt platform=linux/amd64,linux/arm64
           echo "✓ toolchain intact on linux/amd64 and linux/arm64"
 
       - name: Summary