Merge pull request #59 from hashicorp/add-revision-input

adding optional REVISION input

README.md

@@ -64,6 +64,8 @@ see note on `redhat_tag` below.
 ### Action Inputs Explained
 
 - **`version`** is the product version we are building a docker image for.
+- **`revision`** is the revision that's being built. 
+  This may differ from the default <github.sha> which is the ref the action was invoked at.
 - **`target`** is the name of the "stage" or "target" in the Dockerfile to build.
 - **`arch`** is the architecture we're building for.
 - **`tags`** is a newline-separated list of the "production tags" for this image.

action.yml

@@ -16,6 +16,13 @@ inputs:
     description: Target image architecture.
     required: true
 
+  revision:
+    description: >
+      Full sha of the commit that is being built.
+      This may differ from the default <github.sha> which is the ref the action
+      was invoked at.
+    default: "${{ github.sha }}"
+
   tags:
     description: >
       Whitespace-separated fully-qualified image names to use for production releases.
@@ -114,7 +121,7 @@ runs:
       env:
 
         # Required.
-        REVISION: "${{ github.sha }}"
+        REVISION: "${{ inputs.revision }}"
         VERSION: "${{ inputs.version }}"
         ARCH: "${{ inputs.arch }}"
         TAGS: "${{ inputs.tags }}"