Mastodon patched Docker image

build.sh

#!/bin/sh
podman build --format docker -t ghcr.io/exagone313/mastodon:v4.1.10 .
podman push ghcr.io/exagone313/mastodon:v4.1.10

Dockerfile

FROM ghcr.io/mastodon/mastodon:v4.1.10
RUN sed -i 's/500/2048/g' app/javascript/mastodon/features/compose/components/compose_form.js && \
    sed -i 's/500/2048/g' app/validators/status_length_validator.rb && \
    sed -i 's/300/2048/g' app/models/rule.rb

# ---
# Code below is copied from the end of https://github.com/mastodon/mastodon/blob/v4.1.10/Dockerfile
# ---

# Set the run user
USER mastodon
WORKDIR /opt/mastodon

# Precompile assets
RUN OTP_SECRET=precompile_placeholder SECRET_KEY_BASE=precompile_placeholder rails assets:precompile && \
    yarn cache clean

# Set the work dir and the container entry point
ENTRYPOINT ["/usr/bin/tini", "--"]