ci: GHA→ghcr builds for chrome-service-novnc, android-emulator, infra CLI (ADR-0002 #29/#30)

Infra-owned rare-build images move off Woodpecker/manual to GHA (build
from the github checkout — Dockerfiles verified identical on both
remotes). chrome-service-novnc + android-emulator → public ghcr
(dispatch+path). CLI → DockerHub (kept) + ghcr; Woodpecker build-cli.yml
removed. infra-ci handled separately (bootstrap-critical).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/build-android-emulator.yml

@@ -0,0 +1,36 @@
+name: Build android-emulator
+
+# ADR-0002: infra-owned image built off-infra on GHA → ghcr (public).
+# Large image (Android SDK + emulator); on-demand workload (scaled 0). Rebuilds
+# rare → dispatch + path trigger.
+on:
+  push:
+    branches: [master]
+    paths:
+      - 'stacks/android-emulator/docker/**'
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/build-push-action@v6
+        with:
+          context: stacks/android-emulator/docker
+          platforms: linux/amd64
+          provenance: false
+          push: true
+          tags: |
+            ghcr.io/viktorbarzin/android-emulator:latest
+            ghcr.io/viktorbarzin/android-emulator:${{ github.sha }}