title: Cannot install php7-mongodb in alpine linux
body: <p>I am trying to install php7-mongodb with my dockerfile. The same worked until yesterday but today dockerbuild is throwing the following error </p>
  
  <pre><code>Step 4/12 : RUN apk add php7-mongodb
   ---&gt; Running in b6713ea15c9d
    php7-mongodb (missing):
  ERROR: unsatisfiable constraints:
      required by: world[php7-mongodb]
  The command '/bin/sh -c apk add php7-mongodb' returned a non-zero code: 1
  
  </code></pre>
  
  <p>I tried with apk update and apk upgrade in the dockerfile but still not working. any idea what the issue is?</p>
  
  <p>I am using alpine edge as base version.</p>
  
  <p>We can recreate the issue by using the following dockerfile </p>
  
  <pre><code>FROM alpine:edge
  RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" &gt;&gt; /etc/apk/repositories
  RUN apk update &amp;&amp; apk upgrade
  RUN apk add  php7-mongodb
  
  </code></pre>