Support nested composite actions

To reference metadata about composite actions, GitHub Actions provides
the `github.action_` context, including `github.action_path`,
`github.action_ref`, and `github.action_repository`.

GitHub Actions supports nested composite actions with a recursion limit
of 9 (9 nested composite actions). Unfortunately `github.action_` values
are not propagated correctly when running nested composite actions.
This is a bug in the GitHub Actions runner.

The suggested workaround is to use inputs to set the correct values.
This commit will implement the suggested workaround.

https://docs.github.com/en/actions/creating-actions/creating-a-composite-action
https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/accessing-contextual-information-about-workflow-runs#github-context
actions/runner#2473 (comment)
pypa#299

Author: br3ndonland

action.yml

@@ -87,6 +87,27 @@ inputs:
       Only works with PyPI and TestPyPI via Trusted Publishing.
     required: false
     default: 'true'
+  action_path:
+    description: >-
+      [EXPERIMENTAL]
+      Set action path to work around bug in nested composite actions
+      https://github.com/actions/runner/issues/2473
+    required: false
+    default: ${{ github.action_path }}
+  action_repository:
+    description: >-
+      [EXPERIMENTAL]
+      Set action repository to work around bug in nested composite actions
+      https://github.com/actions/runner/issues/2473
+    required: false
+    default: ${{ github.action_repository }}
+  action_ref:
+    description: >-
+      [EXPERIMENTAL]
+      Set action ref to work around bug in nested composite actions
+      https://github.com/actions/runner/issues/2473
+    required: false
+    default: ${{ github.action_ref }}
 branding:
   color: yellow
   icon: upload-cloud
@@ -116,17 +137,21 @@ runs:
     run: |
       # Set repo and ref from which to run Docker container action
       # to handle cases in which `github.action_` context is not set
+      # or set properly for nested composite actions
       # https://github.com/actions/runner/issues/2473
+      ACTION_PATH=${{ env.ACTION_PATH || '.' }}
       REF=${{ env.ACTION_REF || env.PR_REF || github.ref_name }}
       REPO=${{ env.ACTION_REPO || env.PR_REPO || github.repository }}
       REPO_ID=${{ env.PR_REPO_ID || github.repository_id }}
+      echo "action-path=$ACTION_PATH" >>"$GITHUB_OUTPUT"
       echo "ref=$REF" >>"$GITHUB_OUTPUT"
       echo "repo=$REPO" >>"$GITHUB_OUTPUT"
       echo "repo-id=$REPO_ID" >>"$GITHUB_OUTPUT"
     shell: bash
     env:
-      ACTION_REF: ${{ github.action_ref }}
-      ACTION_REPO: ${{ github.action_repository }}
+      ACTION_PATH: ${{ inputs.action_path }}
+      ACTION_REF: ${{ inputs.action_ref }}
+      ACTION_REPO: ${{ inputs.action_repository }}
       PR_REF: ${{ github.event.pull_request.head.ref }}
       PR_REPO: ${{ github.event.pull_request.head.repo.full_name }}
       PR_REPO_ID: ${{ github.event.pull_request.base.repo.id }}
@@ -149,8 +174,9 @@ runs:
         steps.pre-installed-python.outputs.python-path == ''
         && steps.new-python.outputs.python-path
         || steps.pre-installed-python.outputs.python-path
-      }} '${{ github.action_path }}/create-docker-action.py'
+      }} '${{ env.ACTION_PATH }}/create-docker-action.py'
     env:
+      ACTION_PATH: ${{ steps.set-repo-and-ref.outputs.action-path }}
       REF: ${{ steps.set-repo-and-ref.outputs.ref }}
       REPO: ${{ steps.set-repo-and-ref.outputs.repo }}
       REPO_ID: ${{ steps.set-repo-and-ref.outputs.repo-id }}