Add codex auto review gh action

.github/workflows/codex-review.yml

@@ -0,0 +1,99 @@
+name: Codex auto review
+
+on:
+  pull_request_target:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  codex:
+    # Only run Codex for PRs authored by allowed users
+    if: |
+      github.event.pull_request.user.login == 'EmelyanenkoK' ||
+      github.event.pull_request.user.login == 'tolya-yanot' ||
+      github.event.pull_request.user.login == 'SpyCheese' ||
+      github.event.pull_request.user.login == 'neodix42' ||
+      github.event.pull_request.user.login == 'dungeon-master-666' ||
+      github.event.pull_request.user.login == 'igroman787' ||
+      github.event.pull_request.user.login == 'kdimentionaltree' ||
+      github.event.pull_request.user.login == 'sonofmom' ||
+      github.event.pull_request.user.login == 'Trinketer22' ||
+      github.event.pull_request.user.login == 'xssnick' ||
+      github.event.pull_request.user.login == 'tolk-vm' ||
+      github.event.pull_request.user.login == 'DanShaders' ||
+      github.event.pull_request.user.login == 'birydrad' ||
+      github.event.pull_request.user.login == 'abacabadabacaba' ||
+      github.event.pull_request.user.login == 'Mustang98' ||
+      github.event.pull_request.user.login == 'avevad' ||
+      github.event.pull_request.user.login == 'tvorogme' ||
+      github.event.pull_request.user.login == 'krigga'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    outputs:
+      final_message: ${{ steps.run_codex.outputs['final-message'] }}
+
+    steps:
+      # 1. Checkout the trusted base commit
+      - name: Checkout base branch (trusted)
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ github.event.pull_request.base.sha }}
+          fetch-depth: 0
+          persist-credentials: false
+
+      # 2. Fetch PR head as a separate local branch, without checking it out
+      - name: Fetch PR head
+        run: |
+          git fetch origin \
+            pull/${{ github.event.pull_request.number }}/head:pr-${{ github.event.pull_request.number }}
+
+      # Optional diagnostics
+      - name: Show diff summary
+        run: |
+          git diff --stat \
+            ${{ github.event.pull_request.base.sha }} pr-${{ github.event.pull_request.number }}
+
+      # 3. Run Codex safely
+      - name: Run Codex
+        id: run_codex
+        uses: openai/codex-action@02e7b2943818fbac9f077c3d1249a198ab358352
+        with:
+          # IMPORTANT: this is safe only because:
+          # - workflow file lives in base repo (attacker cannot change it)
+          # - we do not run arbitrary PR code, only git commands
+          openai-api-key: ${{ secrets.OPENAI_API_KEY }}
+          prompt: |
+            This is PR #${{ github.event.pull_request.number }} for ${{ github.repository }}.
+
+            Review ONLY the changes introduced by this PR.
+
+            Diff range:
+              ${{ github.event.pull_request.base.sha }}...pr-${{ github.event.pull_request.number }}
+
+            Pull request title and body:
+            ----
+            ${{ github.event.pull_request.title }}
+            ${{ github.event.pull_request.body }}
+
+  post_feedback:
+    runs-on: ubuntu-latest
+    needs: codex
+    if: needs.codex.outputs.final_message != ''
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - name: Report Codex feedback
+        uses: actions/github-script@v7
+        env:
+          CODEX_FINAL_MESSAGE: ${{ needs.codex.outputs.final_message }}
+        with:
+          github-token: ${{ github.token }}
+          script: |
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.payload.pull_request.number,
+              body: process.env.CODEX_FINAL_MESSAGE,
+            });