Merge pull request 'ci: wire up the builder-image workflow and fix repo layout' (#1) from ci/wire-up-builder-image into main

GITEA_TOKEN is not set in these repos — the registry login sent a blank
password and Gitea's /v2/ endpoint returned unauthorized. Switch the
image-build login, the app template, and the README to PACKAGE_TOKEN, the
PAT the other repos already use (Syrinx pairs gitea.actor + PACKAGE_TOKEN
successfully). The PAT needs write:package here and read:package in app
repos.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/builder-image.yml

@@ -38,7 +38,7 @@ jobs:
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ gitea.actor }}
-          password: ${{ secrets.GITEA_TOKEN }}
+          password: ${{ secrets.PACKAGE_TOKEN }}
 
       - name: Set up Buildx
         uses: docker/setup-buildx-action@v3

README.md

@@ -66,7 +66,7 @@ jobs:
       image: git.helu.ca/r/android:2026.06
       credentials:
         username: ${{ gitea.actor }}
-        password: ${{ secrets.GITEA_TOKEN }}
+        password: ${{ secrets.PACKAGE_TOKEN }}
 ```
 
 The build task is selectable: `assembleRelease` (APK, the default) or
@@ -83,9 +83,10 @@ Signing happens at job time; nothing sensitive lives in the repo or the image.
 | `KEY_ALIAS`         | signing key alias |
 | `KEY_PASSWORD`      | key password |
 
-`GITEA_TOKEN` needs `write:package` here (to push) and `read:package` in app
-repos (to pull). The built-in token usually covers this; if your instance
-scopes it tightly, use a PAT.
+`PACKAGE_TOKEN` (a PAT, the same secret the other repos here use) needs
+`write:package` in this repo (to push the image) and `read:package` in app
+repos (to pull it). Set it as a repo or org-level Actions secret. The
+built-in `gitea.token` is not used because it isn't scoped for the registry.
 
 ## First-run sequencing
 

templates/build.yml

@@ -29,7 +29,7 @@ jobs:
       image: git.helu.ca/r/android:2026.06
       credentials:
         username: ${{ gitea.actor }}
-        password: ${{ secrets.GITEA_TOKEN }}
+        password: ${{ secrets.PACKAGE_TOKEN }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4