Drop the GHCR image build; users build with docker compose

Publishing a prebuilt image can wait. Remove the GitHub Actions image
workflow and the IMAGE_PREFIX/IMAGE_TAG image name in docker-compose.yml,
and have the README's quick start build with docker compose up -d
--build, which also rebuilds after a git pull. The mirror's docs and
script no longer mention Actions or the package.

.github/workflows/images.yml

@@ -1,62 +0,0 @@
-# Builds the songtrace image on the GitHub mirror and pushes it to GitHub's
-# container registry, under the repository's owner. Gitea ignores this
-# directory while .gitea/workflows exists, so the forge does not run it.
-name: Images
-
-on:
-  push:
-    branches: [main]
-    tags: ['v*.*.*']
-  workflow_dispatch:
-
-permissions:
-  contents: read
-  packages: write
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      # The image carries CUDA builds of torch, several GB of them, which is
-      # more than a hosted runner has free until its preinstalled toolchains
-      # are gone.
-      - name: Free disk space
-        run: |
-          sudo rm -rf /usr/share/dotnet /usr/local/lib/android /opt/ghc \
-            /opt/hostedtoolcache/CodeQL /usr/local/share/boost
-          sudo docker image prune --all --force
-          df -h /
-
-      - uses: actions/checkout@v4
-
-      - name: Lowercase the owner
-        id: owner
-        shell: bash
-        run: echo "name=${GITHUB_REPOSITORY_OWNER,,}" >> "$GITHUB_OUTPUT"
-
-      - uses: docker/setup-buildx-action@v3
-
-      - uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ghcr.io/${{ steps.owner.outputs.name }}/songtrace
-          tags: |
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
-            type=ref,event=branch
-
-      - uses: docker/build-push-action@v6
-        with:
-          context: .
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          platforms: linux/amd64
-          provenance: false

README.md

@@ -53,22 +53,11 @@ what it got wrong before you sing it.
 ```sh
 cp config.example.toml config.toml
 $EDITOR config.toml   # set whisper_url to your Whisper server
-docker compose up -d
+docker compose up -d --build
 ```
 
-Open `http://localhost:8000`, fill in the form and press **CREATE SONG**.
-
-That builds the image here. To pull the published one instead, put this in a
-`.env` file next to `docker-compose.yml` and run
-`docker compose pull && docker compose up -d`:
-
-```sh
-IMAGE_PREFIX=ghcr.io/branderson/
-IMAGE_TAG=main
-```
-
-`main` follows the `main` branch. Release tags will add `latest` for the
-newest release and `1.2` for the newest of a minor version.
+Open `http://localhost:8000`, fill in the form and press **CREATE SONG**. To
+update, `git pull` and run the same `docker compose` command again.
 
 Finished songs go to `output_dir` (`/data/output` in the container). To write
 them straight into your game's song collection, mount that folder there in
@@ -225,8 +214,8 @@ pytest
 installed. Pull requests run the full suite in CI.
 
 songtrace is developed on a private forge and published to
-[GitHub](https://github.com/branderson/songtrace) as a read-only mirror, which
-also builds the published image; see `mirror/README.md`.
+[GitHub](https://github.com/branderson/songtrace) as a read-only mirror; see
+`mirror/README.md`.
 
 `scripts/screenshot_webui.py` regenerates `docs/images/webui.png` from a
 seeded copy of the app (`playwright install chromium` first). With `ffmpeg` on

docker-compose.yml

@@ -1,9 +1,6 @@
 services:
   songtrace:
-    # built here by default; set IMAGE_PREFIX (and IMAGE_TAG) to pull a
-    # published image instead, see the README's quick start
     build: .
-    image: ${IMAGE_PREFIX:-}songtrace:${IMAGE_TAG:-latest}
     ports:
       - "8000:8000"
     volumes:

mirror/README.md

@@ -4,8 +4,7 @@ songtrace is developed on a private forge. `github-mirror.sh` publishes its
 `main` and the tags on `main` to
 [github.com/branderson/songtrace](https://github.com/branderson/songtrace),
 hourly, from a host that can push to GitHub. Issues and pull requests are off
-there. Actions stays on, since `.github/workflows/images.yml` builds the image
-that `ghcr.io/branderson/songtrace` serves.
+there.
 
 The mirror's `main` is the forge's plus one commit, which adds a read-only notice
 under the README's title. Every forge commit is in the mirror unchanged, and
@@ -21,8 +20,6 @@ instead of publishing without the notice.
    pushing it.
 3. Once the first sync has pushed, run `github-mirror.sh --settings` (needs
    `gh`). It turns off issues, pull requests, projects, wiki and discussions.
-4. The first image build creates the package as private. In its settings on
-   GitHub, set its visibility to public.
 
 The timer runs a copy of the script, not the checkout's. Reinstall it after
 reviewing a change to `mirror/`.

mirror/github-mirror.sh

@@ -54,9 +54,8 @@ transform() {
         || die "README.md: no title to put the mirror notice under"
 }
 
-# Issues, pull requests, wiki and the like off; Actions stays on, since it
-# publishes the image. Settings rather than content, so a sync does not
-# reapply them; run once after creating the repository.
+# Issues, pull requests, wiki and the like off. Settings rather than content,
+# so a sync does not reapply them; run once after creating the repository.
 settings() {
     command -v gh >/dev/null || die "--settings needs the gh CLI"
     gh api -X PATCH "repos/$MIRROR_REPO" --silent \