Add initial files

action.yml

@@ -0,0 +1,28 @@
+name: Codex Bot
+description: Run Codex CLI for approved Gitea issue/PR automation
+
+inputs:
+  gitea-token:
+    required: true
+
+runs:
+  using: composite
+  steps:
+    # This step assumes this is `node:24-bookworm` container.
+    - name: Install dependencies
+      shell: bash
+      run: |
+        apt-get update
+        apt-get install -y --no-install-recommends gettext-base jq
+        npm install -g @openai/codex
+
+    - name: Run Codex Bot
+      shell: bash
+      run: bash "${ACTION_PATH}/scripts/run-codex.sh"
+      env:
+        ACTION_PATH: ${{ gitea.action_path }}
+        GITEA_API_URL: ${{ gitea.api_url }}
+        GITEA_REPOSITORY: ${{ gitea.repository }}
+        GITEA_TOKEN: ${{ inputs.gitea-token }}
+        ISSUE_INDEX: ${{ gitea.event.issue.number }}
+        COMMENT_BODY: ${{ gitea.event.comment.body }}