Imagemagick enable delegate build and disabled using shared libraries (#889)

compiles to a single portable binary

Create a base builder package with compile time dependencies. Create an
imagemagick_builder to build imagemagick.

The base builder can be extended for other builders.

Add imagemagick runtime dependencies to discourse_dependencies image
avoid -dev libs

Statically compile as much as possible with --disable-shared and
--enable-delegate-build flags.
References:
https://stackoverflow.com/questions/47031789/imagemagick-100-static-build-for-linux
https://www.imagemagick.org/discourse-server/viewtopic.php?t=14259

Add fonts-urw-base35 for NimbusSans-Regular, needed for letter avatar generation

Copy over the resulting magick bin, as well as etc and share files from the
compilation. etc is needed for magick to run, share is not, but contains
translations for errors which Discourse tests are dependent on reading from.

Create symlinks for other magick tooling - imagemagick creates symlink tool
names that Discourse uses. These *could* be dropped if Discourse decided to use
`magick {toolname}` rather than `{toolname}`.

Add nginx compile dependency - building nginx still needs libfreetype6
This was implicitly installed previously. Removing the imagemagick build from
base broke the next nginx build. Add this dependency back in. This dependency
can be removed once we build nginx separately as well.

image/base/Dockerfile

@@ -2,6 +2,21 @@
 # VERSION:  release
 
 ARG DEBIAN_RELEASE=bookworm
+FROM discourse/ruby:3.3.6-${DEBIAN_RELEASE}-slim AS builder
+RUN apt update && \
+DEBIAN_FRONTEND=noninteractive apt-get -y install wget \
+    autoconf build-essential \
+    git \
+    cmake \
+    gnupg \
+    libpcre3-dev \
+    libfreetype6-dev \
+    libbrotli-dev
+
+FROM builder AS imagemagick_builder
+ADD install-imagemagick /tmp/install-imagemagick
+RUN /tmp/install-imagemagick
+
 FROM discourse/ruby:3.3.6-${DEBIAN_RELEASE}-slim AS discourse_dependencies
 
 ARG DEBIAN_RELEASE
@@ -36,7 +51,13 @@ RUN --mount=type=tmpfs,target=/var/log \
     libreadline-dev anacron wget \
     psmisc whois brotli libunwind-dev \
     libtcmalloc-minimal4 cmake \
-    pngcrush pngquant ripgrep poppler-utils; \
+    pngcrush pngquant ripgrep poppler-utils \
+# imagemagick runtime dependencies
+    libheif1 libjbig0 libtiff6 libpng16-16 libfontconfig1 \
+    libwebpdemux2 libwebpmux3 libxext6 librsvg2-2 libgomp1 \
+    fonts-urw-base35 \
+# nginx compile dependencies \
+    libfreetype6-dev && \
 # install these without recommends to avoid pulling in e.g.
 # X11 libraries, mailutils
     DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends git rsyslog logrotate cron ssh-client less; \
@@ -70,8 +91,24 @@ RUN sed -i "s/^# $LANG/$LANG/" /etc/locale.gen; \
 RUN --mount=type=tmpfs,target=/root/.npm \
     npm install -g terser uglify-js pnpm
 
-ADD install-imagemagick /tmp/install-imagemagick
-RUN /tmp/install-imagemagick
+# Copy binary and configuration files for magick
+COPY --from=imagemagick_builder /usr/local/bin/magick /usr/local/bin/magick
+COPY --from=imagemagick_builder /usr/local/etc/ImageMagick-7 /usr/local/etc/ImageMagick-7
+COPY --from=imagemagick_builder /usr/local/share/ImageMagick-7 /usr/local/share/ImageMagick-7
+# Create symlinks to imagemagick tools
+RUN ln -s /usr/local/bin/magick /usr/local/bin/animate &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/compare &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/composite &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/conjure &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/convert &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/display &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/identify &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/import &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/magick-script &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/mogrify &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/montage &&\
+  ln -s /usr/local/bin/magick /usr/local/bin/stream &&\
+  test $(magick -version | grep -o -e png -e tiff -e jpeg -e freetype -e heic -e webp | wc -l) -eq 6
 
 ADD install-jemalloc /tmp/install-jemalloc
 RUN /tmp/install-jemalloc

image/base/install-imagemagick

@@ -42,6 +42,8 @@ tar zxf $WDIR/ImageMagick.tar.gz -C $WDIR
 cd $IMDIR
 PKG_CONF_LIBDIR=$PREFIX/lib LDFLAGS=-L$PREFIX/lib CFLAGS='-O2 -I$PREFIX/include' ./configure \
           --prefix=$PREFIX \
+          --disable-shared \
+          --enable-delegate-build \
           --enable-static \
           --enable-bounds-checking \
           --enable-hdri \