Docker: Centralize repo dependencies

Now, we have `docker/scripts/install-deps.sh`, a script used
by both Docker and .gitlab-ci.yml. We can now focus on changing
deps in this script along as well as documentation going forward.

Signed-off-by: Kevin Morris <kevr@0cost.org>

docker/scripts/install-deps.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Install Arch Linux dependencies. This is centralized here
+# for CI and Docker usage and should always reflect the most
+# robust development ecosystem.
+set -eou pipefail
+
+pacman -Syu --noconfirm --noprogressbar \
+    --cachedir .pkg-cache git gpgme protobuf pyalpm \
+    python-mysqlclient python-pygit2 python-srcinfo python-bleach \
+    python-markdown python-sqlalchemy python-alembic python-pytest \
+    python-werkzeug python-pytest-tap python-fastapi nginx python-authlib \
+    python-itsdangerous python-httpx python-jinja python-pytest-cov \
+    python-requests python-aiofiles python-python-multipart \
+    python-pytest-asyncio python-coverage hypercorn python-bcrypt \
+    python-email-validator openssh python-lxml mariadb mariadb-libs \
+    python-isort flake8 cgit uwsgi uwsgi-plugin-cgi php php-fpm \
+    python-asgiref uvicorn
+
+exec "$@"