fix(IMAGEMAGICK extension): implement building extension for PHP 8.0 from source

We need to build imagemagick extension from sources due the latest version, that supports PHP 8.0 has not been released to PECL.

Closes #2861

laravel-horizon/Dockerfile

@@ -74,10 +74,28 @@ RUN if [ ${INSTALL_GMP} = true ]; then \
 
 #Install ImageMagick package:
 ARG INSTALL_IMAGEMAGICK=false
+ARG IMAGEMAGICK_VERSION=latest
+ENV IMAGEMAGICK_VERSION ${IMAGEMAGICK_VERSION}
 RUN set -eux; \
   if [ ${INSTALL_IMAGEMAGICK} = true ]; then \
     apk add --update --no-cache imagemagick-dev; \
-    pecl install imagick; \
+    if [ $(php -r "echo PHP_MAJOR_VERSION;") = "8" ]; then \
+      apk add --update --no-cache git && \
+      cd /tmp && \
+      if [ ${IMAGEMAGICK_VERSION} = "latest" ]; then \
+        git clone https://github.com/Imagick/imagick; \
+      else \
+        git clone --branch ${IMAGEMAGICK_VERSION} https://github.com/Imagick/imagick; \
+      fi && \
+      cd imagick && \
+      phpize && \
+      ./configure && \
+      make && \
+      make install && \
+      rm -r /tmp/imagick; \
+    else \
+      pecl install imagick; \
+    fi && \
     docker-php-ext-enable imagick; \
     php -m | grep -q 'imagick'; \
   fi