Fetch PR body inside checker

Authored-By: Codex (GPT-5) <noreply@openai.com>

action.yaml

@@ -26,9 +26,6 @@ inputs:
       dfritz is exempt from all checks.
     required: false
     default: ''
-  pr-body:
-    description: PR description — github.event.pull_request.body.
-    required: true
   server-url:
     description: Gitea server URL — github.server_url.
     required: true
@@ -51,9 +48,10 @@ runs:
         HEAD_BRANCH: ${{ inputs.head-branch }}
         PR_TITLE: ${{ inputs.pr-title }}
         PR_AUTHOR: ${{ inputs.pr-author }}
-        PR_BODY: ${{ inputs.pr-body }}
         GITEA_SERVER_URL: ${{ inputs.server-url }}
         GITEA_TOKEN: ${{ inputs.token }}
+        GITEA_REPOSITORY: ${{ github.repository }}
+        GITEA_PR_NUMBER: ${{ github.event.pull_request.number }}
         BASE_SHA: ${{ inputs.base-sha }}
         HEAD_SHA: ${{ inputs.head-sha }}
       run: bash "${{ github.action_path }}/check.sh"