I&#39;m trying to push to `origin` remote from GitHub action. The logic of my action is:

 - handle `pull_request_review` events and filter by comment message
 - checkout to master, merge PR branch, run some checks and push it to `origin`

The script is:
```bash
if [[ &quot;${GITHUB_EVENT_NAME}&quot; != &quot;pull_request_review&quot; ]]; then
  echo &quot;unsupported event: ${GITHUB_EVENT_NAME}&quot;
  exit 1
fi

user=$(jq -r .review.user.login ${GITHUB_EVENT_PATH})
cmd=$(jq -r .review.body ${GITHUB_EVENT_PATH})
echo &quot;reviewer is ${user}, command is ${cmd}&quot;

if [[ &quot;${cmd}&quot; == &quot;merge&quot; ]]; then
  head=$(jq -r .pull_request.head.ref ${GITHUB_EVENT_PATH})
  git config user.email test@test.com
  git config user.name test
  git checkout -B _tmp origin/${head}
  git checkout -B master origin/master
  git merge --no-ff _tmp
  git push origin master
fi
```
I&#39;m running this script from `alpine:3.10` Docker container:
```Dockerfile
FROM alpine:3.10

LABEL &quot;com.github.actions.name&quot;=&quot;Hello world action&quot;
LABEL &quot;com.github.actions.icon&quot;=&quot;shield&quot;
LABEL &quot;com.github.actions.color&quot;=&quot;green&quot;

WORKDIR /app
COPY action.sh action.sh
RUN apk --update add bash git jq
CMD [&quot;bash&quot;, &quot;/app/action.sh&quot;]
```

First steps are working fine (checkout and merge), but action failed to push the merge to `origin` because of the error:
&gt; \+ git push origin master&lt;br/&gt;
&gt; fatal: could not read Username for &#39;https://github.com&#39;: No such device or address

It looks like GitHub-action Docker container is not configured to push to GitHub. How can I configure it? Is it possible to use some of the [env variables](https://help.github.com/en/articles/virtual-environments-for-github-actions#environment-variables) provided by GitHub or maybe some mounted files (like in `/github/*` path)?

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Push to origin from GitHub action