Nextcloud Alpine Docker image with modified imagemagick to work around wrongly rendered single-letter avatars

Dockerfile

# HACK - compile imagemagick package with --without-rsvg flag to work around #34755

FROM nextcloud:26-fpm-alpine AS custom-imagemagick

# Build deps
RUN apk add --no-cache \
  alpine-sdk grep \
  chrpath fontconfig-dev freetype-dev ghostscript-dev lcms2-dev libheif-dev \
  libjpeg-turbo-dev libpng-dev libjxl-dev librsvg-dev libtool libwebp-dev \
  libx11-dev libxext-dev libxml2-dev perl-dev tiff-dev zlib-dev \
  ghostscript-fonts graphviz

# Make cache dir writable
RUN mkdir -p /var/cache/distfiles && \
  chmod a+w /var/cache/distfiles

# Can't build packages as root
RUN adduser -D -k /var/empty -h /var/tmp/apkbuild apkbuild
USER apkbuild

WORKDIR /var/tmp/apkbuild/imagemagick

RUN abuild-keygen -a -n

# Download matching APKBUILD of imagemagick for this Alpine version
RUN \
  set -x && \
  . /etc/os-release && \
  VERSION=$(printf '%s' "$VERSION_ID" | grep -Po '^\d+\.\d+') && \
  wget -OAPKBUILD https://git.alpinelinux.org/aports/plain/community/imagemagick/APKBUILD?id=${VERSION}-stable

# They moved the archived versions to another URL...
RUN sed -i \
  -e 's,--with-rsvg,--without-rsvg,' \
  -e 's,https://imagemagick.org/archive/,https://imagemagick.org/archive/releases/,' \
  APKBUILD

RUN abuild

###

FROM nextcloud:26-fpm-alpine 

COPY --from=custom-imagemagick /var/tmp/apkbuild/.abuild/*.pub /etc/apk/keys/
COPY --from=custom-imagemagick /var/tmp/apkbuild/packages/ /root/packages/

RUN set -ex; \
    apk add --no-cache /root/packages/apkbuild/*/*.apk; \
    rm -r /root/packages