Document docker tag file

README.md

@@ -36,6 +36,11 @@ For example: `gd xdebug-2.9.7 zip`.
 
 The functionality of building PHP extensions is provided by [mlocati's docker-php-extension-installer repository][mlocati]. A full list of supported extension names is [available within the readme][mlocati-readme].
 
+Using the docker tag from subsequent scripts
+--------------------------------------------
+
+Once the Docker image is built and tagged, the name of the tag will be written to a file called `docker-tag` within the current working directory. This can then be read by a subsequent script.
+
 ***
 
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php-build.bash

@@ -84,9 +84,6 @@ dockerfile_unique="${dockerfile_unique,,}"
 docker_tag="docker.pkg.github.com/${GITHUB_REPOSITORY}/php-actions_${base_repo}:${dockerfile_unique}"
 echo "$docker_tag" > ./docker_tag
 
-github_action_path=$(dirname "$0")
-cd "${github_action_path}"
-
 # Attempt to pull the existing Docker image, if it exists. If the image has
 # been pushed previously, this image should take preference and a new image
 # will not need to be built.