feat: add proxyproto test

.forgejo/workflows/end-to-end.yml

@@ -164,3 +164,21 @@ jobs:
       - name: full logs
         if: always()
         run: su forgejo -c "./end-to-end.sh show_logs"
+
+  proxyproto:
+    name: PROXY protocol
+    needs: [build]
+    runs-on: lxc-trixie
+    steps:
+      - uses: https://data.forgejo.org/actions/checkout@v4
+      - uses: ./.forgejo/prepare-end-to-end
+        with:
+          built: ${{ needs.build.outputs.built }}
+      - run: su forgejo -c "./end-to-end.sh test_proxyproto"
+      - if: ${{ needs.build.outputs.built == 'yes' }}
+        uses: ./.forgejo/upload-coverage
+        with:
+          scope: proxy
+      - name: full logs
+        if: always()
+        run: su forgejo -c "./end-to-end.sh show_logs"