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

php-worker/Dockerfile

@@ -69,11 +69,31 @@ RUN if [ ${INSTALL_GD} = true ]; then \
 
 #Install ImageMagick:
 ARG INSTALL_IMAGEMAGICK=false
-RUN if [ ${INSTALL_IMAGEMAGICK} = true ]; then \
-  apk add --update imagemagick-dev imagemagick; \
-  pecl install imagick; \
-  docker-php-ext-enable imagick \
-;fi
+ARG IMAGEMAGICK_VERSION=latest
+ENV IMAGEMAGICK_VERSION ${IMAGEMAGICK_VERSION}
+RUN set -eux; \
+  if [ ${INSTALL_IMAGEMAGICK} = true ]; then \
+    apk add --update --no-cache imagemagick-dev; \
+    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
 
 #Install GMP package:
 ARG INSTALL_GMP=false