ci: run tests inside docker

Run the tests using the Docker image we just built, instead of
installing everything manually and running the tests outside of Docker.
Ensures the Docker image we built really works.

.github/workflows/test.yaml

@@ -46,6 +46,7 @@ jobs:
           images: ghcr.io/${{ github.repository }}
           tags: |
             type=sha,format=short,prefix=
+            type=sha,format=long,prefix=
             type=ref,event=branch
             type=ref,event=tag
             type=ref,event=pr
@@ -69,14 +70,13 @@ jobs:
 
   test:
     runs-on: ubuntu-latest
-    container: ubuntu:20.10
-
-    defaults:
-      run:
-        shell: bash
+    needs: docker
+    container:
+      image: ghcr.io/danbooru/danbooru:${{ github.sha }}
+      options: --user root
 
     env:
-      DEBIAN_FRONTEND: noninteractive
+      RAILS_ENV: test
       PARALLEL_WORKERS: 8 # number of parallel tests to run
       RUBYOPT: -W0 # silence ruby warnings
       VIPS_WARNING: 0 # silence libvips warnings
@@ -125,33 +125,32 @@ jobs:
           POSTGRES_PASSWORD: danbooru
 
     steps:
-    - name: Install OS dependencies
-      run: |
-        apt-get update
-        apt-get -y install --no-install-recommends build-essential ruby ruby-dev ruby-bundler git nodejs yarnpkg webpack ffmpeg mkvtoolnix libvips-dev libxml2-dev libxslt-dev zlib1g-dev postgresql-server-dev-all wget curl git
-        ln -sf /usr/bin/yarnpkg /usr/bin/yarn
-
-    - name: Check out code
-      uses: actions/checkout@v2
-      with:
-        fetch-depth: 0
-
-    - name: Install Ruby dependencies
-      run: BUNDLE_DEPLOYMENT=true bundle install --jobs 4
-
-    - name: Install Javascript dependencies
-      run: yarn install
-
-    - name: Prepare database
-      run: config/docker/prepare-tests.sh
-
     - name: Setup tmate session
       uses: mxschmitt/action-tmate@v3
-      timeout-minutes: 10
+      timeout-minutes: 20
       if: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.debug_enabled }}
       with:
         limit-access-to-actor: true
         sudo: false
 
+    - name: Prepare database
+      run: |
+        export HOME=/root
+        cd /danbooru
+        bin/rails db:test:prepare
+
+        apt-get update
+        apt-get -y install --no-install-recommends ruby-dev postgresql-server-dev-all build-essential zlib1g-dev git
+        mkdir ~/archives
+        cd ~/archives
+        git clone https://github.com/evazion/archives .
+        gem install bundler -v 1.13.3
+        bundle install --binstubs
+        bin/rake db:migrate
+
     - name: Run tests
-      run: bin/rails test
+      run: |
+        export HOME=/root
+        cd /danbooru
+        ln -s packs public/packs-test
+        bin/rails test