diff --git a/.forgejo/README.md b/.forgejo/README.md
index 4388b26..b1eee69 100644
--- a/.forgejo/README.md
+++ b/.forgejo/README.md
@@ -58,6 +58,21 @@ export REGISTRY_TOKEN='<your-token>'
 - ✅ Deterministic behavior
 - ✅ Easy to debug
 
+**Runner Selection**:
+
+Workflow uses: `runs-on: rust`
+
+Available runners in Forgejo:
+- `golang` - golang:1.26-bookworm + dind (for Go projects)
+- `rust` - rust:1.83-bookworm + dind (✅ for Rust projects)
+- `node` - node:22-bookworm (for Node.js projects)
+
+Why `rust` for poimen-memory:
+- ✅ Pre-installed Rust toolchain
+- ✅ Docker-in-Docker (dind) for image builds
+- ✅ 2 CPU, 4GB RAM limits (sufficient)
+- ✅ 1.83-bookworm base (production-ready)
+
 ## CI Status
 
 Check latest build: Forgejo repository → Actions tab
diff --git a/.forgejo/workflows/build.yaml b/.forgejo/workflows/build.yaml
index 6922d86..59fcae5 100644
--- a/.forgejo/workflows/build.yaml
+++ b/.forgejo/workflows/build.yaml
@@ -8,7 +8,10 @@ on:
 jobs:
   build-and-push:
     name: Build and Push Image
-    runs-on: docker
+    # Use 'rust' runner (not 'docker')
+    # Available runners in Forgejo: golang, rust, node
+    # rust runner provides: Rust 1.83-bookworm + Docker-in-Docker for image builds
+    runs-on: rust
     steps:
       - name: Checkout code
         uses: actions/checkout@v4