Dropped installing the json extension, is included in PHP's core.

TrafeX · TrafeX · commit f4db6cea400f · 2022-03-20T06:26:17.000+01:00
Fixes #89
diff --git a/Dockerfile b/Dockerfile
@@ -16,7 +16,6 @@ RUN apk add --no-cache \
   php8-fpm \
   php8-gd \
   php8-intl \
-  php8-json \
   php8-mbstring \
   php8-mysqli \
   php8-opcache \
