install imagemagick from git

webservice/Dockerfile

@@ -62,9 +62,20 @@ RUN \
     CFLAGS="-I/usr/src/php" docker-php-ext-install xmlreader
 
 RUN \
-    pecl install -o -f apcu imagick-beta && \
+    pecl install -o -f apcu && \
     rm -rf /tmp/pear && \
-    docker-php-ext-enable apcu imagick
+    docker-php-ext-enable apcu
+
+# compile imagick from master branch as there isn't any release for php8 yet.
+ENV IMAGICK_SHA 448c1cd0d58ba2838b9b6dff71c9b7e70a401b90
+RUN \
+    curl -L -o /tmp/imagick.tar.gz https://github.com/Imagick/imagick/archive/${IMAGICK_SHA}.tar.gz &&\
+    tar --strip-components=1 -xf /tmp/imagick.tar.gz &&\
+    phpize &&\
+    ./configure &&\
+    make &&\
+    make install &&\
+    docker-php-ext-enable imagick
 
 # Activate user-defined .htaccess
 RUN \