Convert to composite action format

Author: karldreher

.github/composite/docs/Dockerfile

@@ -43,20 +43,23 @@ outputs:
   created:
     description: 'Whether the pull request was created'
 runs:
-  using: 'docker'
-  image: 'Dockerfile'
-  args:
-    - ${{ inputs.source-path }}
-    - ${{ inputs.destination-repo }}
-    - ${{ inputs.destination-path }}
-    - ${{ inputs.user-email }}
-    - ${{ inputs.user-name }}
-    - ${{ inputs.destination-head-branch }}
-    - ${{ inputs.destination-base-branch }}
-    - ${{ inputs.pull-request-reviewers }}
-    - ${{ inputs.title }}
-    - ${{ inputs.body }}
-    - ${{ inputs.label }}
+  using: 'composite'
+  steps:
+    - name: Run copy and create PR
+      shell: bash
+      env:
+        INPUT_SOURCE_PATH: ${{ inputs.source_path }}
+        INPUT_DESTINATION_REPO: ${{ inputs.destination_repo }}
+        INPUT_DESTINATION_PATH: ${{ inputs.destination_path }}
+        INPUT_USER_EMAIL: ${{ inputs.user_email }}
+        INPUT_USER_NAME: ${{ inputs.user_name }}
+        INPUT_DESTINATION_HEAD_BRANCH: ${{ inputs.destination_head_branch }}
+        INPUT_DESTINATION_BASE_BRANCH: ${{ inputs.destination_base_branch }}
+        INPUT_PULL_REQUEST_REVIEWERS: ${{ inputs.pull_request_reviewers }}
+        INPUT_TITLE: ${{ inputs.title }}
+        INPUT_BODY: ${{ inputs.body }}
+        INPUT_LABEL: ${{ inputs.label }}
+      run: ${{ github.action_path }}/entrypoint.sh
 branding:
   icon: 'git-commit'
   color: 'green'