use chromium and chromium-chromedriver from alpine 3.9 repo

Dockerfile

@@ -8,6 +8,7 @@ ENV PHP_OPCACHE_VALIDATE_TIMESTAMPS="0" \
 RUN apk info \
     && echo @edge http://nl.alpinelinux.org/alpine/edge/community >> /etc/apk/repositories \
     && echo @edge http://nl.alpinelinux.org/alpine/edge/main >> /etc/apk/repositories \
+    && echo @3.9 http://dl-cdn.alpinelinux.org/alpine/v3.9/main >> /etc/apk/repositories \
     && apk update \
     && apk upgrade \
     && apk add --no-cache --virtual .build-deps \
@@ -35,8 +36,8 @@ RUN apk info \
         mysql-client \
         yarn@edge \
         xvfb \
-        chromium@edge \
-        chromium-chromedriver@edge \
+        chromium@3.9 \
+        chromium-chromedriver@3.9 \
     && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-png-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
     && docker-php-ext-install -j$(nproc) \
         gd \