docker: switch back to debian base image

Alpine builds are taking a very long time, possibly due to python dependencies
lacking pre-built musl wheels [1]. Moreover resulting image sizes are
comparable so benefit of alpine here is ambiguous at best.

[1] https://megamorf.gitlab.io/2020/05/06/why-it-s-better-not-to-use-alpine-linux-for-python-projects/

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3-alpine
+FROM python:3.10.5-bullseye
 
 RUN mkdir /app
 WORKDIR /app
@@ -9,27 +9,21 @@ ENV SHELL=/bin/sh \
    KEGBOT_IN_DOCKER=True \
    KEGBOT_ENV=debug
 
-RUN apk update && \
-    apk add --no-cache \
-      bash \
-      curl \
-      libjpeg \
-      libjpeg-turbo \
-      openjpeg \
-      mariadb-connector-c-dev \
-      libpq && \
-   apk add --no-cache --virtual _build-deps \
-     build-base \
-     mariadb-dev \
-     postgresql-dev \
-     libjpeg-turbo-dev \
-     zlib-dev \
-     py-gevent \
-     libffi-dev \
-     musl-dev \
-     python3-dev \
-     openssl-dev \
-     cargo
+RUN apt-get -qq update && DEBIAN_FRONTEND=noninteractive apt-get -y install \
+    curl \
+    libffi-dev \
+    libfreetype6-dev \
+    libfribidi-dev \
+    libharfbuzz-dev \
+    libjpeg-turbo-progs \
+    libjpeg62-turbo-dev \
+    liblcms2-dev \
+    libopenjp2-7-dev \
+    libtiff5-dev \
+    libwebp-dev \
+    libssl-dev \
+    zlib1g-dev \
+    && rm -rf /var/lib/apt/lists/*
 
 RUN pip install poetry