Add nightly build config

Author: laymonage

Dockerfile

@@ -1,3 +1,4 @@
+ARG NIGHTLY=0
 FROM python:3.12-slim
 
 # Install packages needed to run your application (not build deps):
@@ -39,6 +40,11 @@ RUN set -ex \
     && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false $BUILD_DEPS \
     && rm -rf /var/lib/apt/lists/*
 
+RUN [ "$NIGHTLY" -eq "1" ] && \
+    curl -s https://releases.wagtail.org/nightly/latest.json | \
+    grep -o 'https://[^"]*' | \
+    xargs python3.12 -m pip install
+
 RUN mkdir /code/
 WORKDIR /code/
 ADD . /code/

heroku.yml

@@ -2,6 +2,8 @@ build:
   docker:
     web:
       dockerfile: Dockerfile
+  config:
+    NIGHTLY: 1
 
 release:
   image: web