Add libyaml-dev for psych gem failing to install

I don't know what changed recently but this gem no longer installs
without adding a system library for yaml processing.

There haven't been any new releases to prompt this change.

CHANGELOG.md

@@ -12,6 +12,7 @@ Changelog](https://keepachangelog.com/en/1.0.0/).
 - `URL_HOST` environment variable for setting `default_url_options[:host]`
 - `./run bundle [...]` to run any Bundler command
 - `./run yarn [...]` to run any Yarn command
+- `libyaml-dev` as a system library so the psych gem can be installed
 
 #### Back-end dependencies
 

Dockerfile

@@ -7,7 +7,7 @@ ARG UID=1000
 ARG GID=1000
 
 RUN bash -c "set -o pipefail && apt-get update \
-  && apt-get install -y --no-install-recommends build-essential curl git libpq-dev \
+  && apt-get install -y --no-install-recommends build-essential curl git libpq-dev libyaml-dev \
   && curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key -o /etc/apt/keyrings/nodesource.asc \
   && echo 'deb [signed-by=/etc/apt/keyrings/nodesource.asc] https://deb.nodesource.com/node_22.x nodistro main' | tee /etc/apt/sources.list.d/nodesource.list \
   && apt-get update && apt-get install -y --no-install-recommends nodejs \