Rename shortSHA -> IMAGE_TAG

Author: creekorful

README.md

@@ -20,11 +20,11 @@ The GitHub Package Registry allows you to develop your code and host your packag
 
 This Action will automatically tag each image as follows:
 
-    {Image_Name}:{shortSHA}
+    {Image_Name}:{IMAGE_TAG}
 
 Where:
 - `Image_Name` is provided by the user as an input.
-- `shortSHA` is either the first 12 characters of the GitHub commit SHA or the value of IMAGE_TAG env variable
+- `IMAGE_TAG` is either the first 12 characters of the GitHub commit SHA or the value of INPUT_IMAGE_TAG env variable
 
 ## Usage
 
@@ -83,7 +83,7 @@ jobs:
 
 You can reference the outputs of an action using [expression syntax](https://help.github.com/en/articles/contexts-and-expression-syntax-for-github-actions), as illustrated in the Example Pipeline above.
 
-1. `IMAGE_SHA_NAME`: This is the `{Image_Name}:{shortSHA}` as described above.
+1. `IMAGE_SHA_NAME`: This is the `{Image_Name}:{IMAGE_TAG}` as described above.
 2. `IMAGE_URL`: This is the URL on GitHub where you can view your hosted Docker images.  This will always be located at `https://github.com/{OWNER}/{REPOSITORY}/packages` in reference to the repository where the action was called.
 
 These outputs are merely provided as convenience incase you want to use these values in subsequent steps.

entrypoint.sh

@@ -33,9 +33,9 @@ if [[ -z "$INPUT_BUILD_CONTEXT" ]]; then
 fi
 
 if [[ -z "$INPUT_IMAGE_TAG" ]]; then
-	shortSHA=$(echo "${GITHUB_SHA}" | cut -c1-12)
+	IMAGE_TAG=$(echo "${GITHUB_SHA}" | cut -c1-12)
 else
-	shortSHA=$INPUT_IMAGE_TAG
+	IMAGE_TAG=$INPUT_IMAGE_TAG
 fi
 
 # The following environment variables will be provided by the environment automatically: GITHUB_REPOSITORY, GITHUB_SHA
@@ -45,7 +45,7 @@ echo ${INPUT_PASSWORD} | docker login -u ${INPUT_USERNAME} --password-stdin dock
 
 # Set Local Variables
 BASE_NAME="docker.pkg.github.com/${GITHUB_REPOSITORY}/${INPUT_IMAGE_NAME}"
-SHA_NAME="${BASE_NAME}:${shortSHA}"
+SHA_NAME="${BASE_NAME}:${IMAGE_TAG}"
 
 # Add Arguments For Caching
 BUILDPARAMS=""