Add Pretix with own list of plugins

We want to be able to use plugins in our Pretix, so build a custom image with them. Initially only the pretix-passbook plugin is active.

.forgejo/workflows/build_pretix.yml

@@ -0,0 +1,44 @@
+name: Build Pretix
+
+on:
+  workflow_dispatch: {}
+  push:
+    paths:
+      - '.forgejo/workflows/build_pretix.yml'
+      - 'pretix/**'
+  schedule:
+    - cron: "@daily"
+
+jobs:
+  build-container:
+    name: Build Pretix Image
+    runs-on: docker
+    container:
+      image: ghcr.io/osscontainertools/kaniko:alpine
+    strategy:
+      matrix:
+        pretix-version:
+          # renovate: datasource=docker depName=docker.io/pretix/standalone
+          - 2026.8
+    steps:
+      - name: Install required system packages
+        run: apk add --no-cache nodejs
+
+      - name: Checkout Source Code
+        uses: actions/checkout@v7
+
+      - name: Build Container
+        env:
+          KANIKO_NO_PUSH: ${{ forgejo.ref_name != 'main' }}
+          KANIKO_GIT_HAMBURG_CCC_DE_USER: forgejo-actions
+          KANIKO_GIT_HAMBURG_CCC_DE_PASSWORD: ${{ secrets.PACKAGES_TOKEN }}
+        run: /kaniko/executor
+          --dockerfile="${{forgejo.workspace }}/pretix/Containerfile"
+          --context="dir://${{ forgejo.workspace }}/pretix"
+          --build-arg=TAG=${{ matrix.pretix-version }}
+          --destination=git.hamburg.ccc.de/ccchh/oci-images/pretix:${{ matrix.pretix-version }}
+          --no-push-cache
+          --credential-helpers=env
+          --annotation=org.opencontainers.image.ref.name=pretix
+          --annotation=org.opencontainers.image.url=${{ forgejo.server_url }}/${{ forgejo.repository }}
+          --annotation=org.opencontainers.image.source=${{ forgejo.server_url }}/${{ forgejo.repository }}

README.md

@@ -12,6 +12,7 @@ Tools in use:
 
 - `git.hamburg.ccc.de/CCCHH/oci-images/keycloak`
 - `git.hamburg.ccc.de/CCCHH/oci-images/nextcloud`
+- `git.hamburg.ccc.de/CCCHH/oci-images/pretix`
 - `git.hamburg.ccc.de/CCCHH/oci-images/penpot/frontend`
 - `git.hamburg.ccc.de/CCCHH/oci-images/penpot/backend`
 - `git.hamburg.ccc.de/CCCHH/oci-images/penpot/exporter`

pretix/Containerfile

@@ -0,0 +1,12 @@
+ARG TAG=latest
+
+FROM docker.io/pretix/standalone:${TAG}
+
+USER root
+COPY requirements.txt /tmp/plugin-requirements.txt
+RUN pip3 install --no-cache-dir -r /tmp/plugin-requirements.txt \
+    && rm /tmp/plugin-requirements.txt
+
+USER pretixuser
+# Compile static files and translations, including those of the plugins.
+RUN cd /pretix/src && make production

pretix/requirements.txt

@@ -0,0 +1,3 @@
+# Pretix plugins to install into the image.
+# Pin versions so Renovate can propose updates.
+pretix-passbook==1.14.1