.gitea/workflows/dev.yaml

@@ -77,7 +77,13 @@ jobs:
 
       - name: Prune Docker to reclaim disk
         run: |
-          docker system prune -f 2>&1 || echo "prune skipped (another prune in progress)"
+          # Remove stopped containers, dangling images, unused volumes/networks.
+          # Do NOT prune build cache — that keeps Docker builds fast and under
+          # the ~26min runner restart window. Selective pruning frees ~4-5GB
+          # which is enough to prevent overlay2 "no space left on device" errors.
+          docker container prune -f 2>&1 || true
+          docker image prune -f 2>&1 || true
+          docker volume prune -f 2>&1 || true
           df -h /
 
       # ── El SDK setup ──────────────────────────────────────────────────────

.gitea/workflows/stage.yaml

@@ -98,7 +98,13 @@ jobs:
 
       - name: Prune Docker to reclaim disk
         run: |
-          docker system prune -f 2>&1 || echo "prune skipped (another prune in progress)"
+          # Remove stopped containers, dangling images, unused volumes/networks.
+          # Do NOT prune build cache — that keeps Docker builds fast and under
+          # the ~26min runner restart window. Selective pruning frees ~4-5GB
+          # which is enough to prevent overlay2 "no space left on device" errors.
+          docker container prune -f 2>&1 || true
+          docker image prune -f 2>&1 || true
+          docker volume prune -f 2>&1 || true
           df -h /
 
       - name: Compute image tag

Dockerfile.stage

@@ -44,7 +44,7 @@ RUN cc -O2 -rdynamic \
        -lcurl -lpthread -ldl -lm -lssl -lcrypto
 
 # ── Download k3s binary ───────────────────────────────────────────────────────
-RUN curl -fL https://github.com/k3s-io/k3s/releases/download/v1.32.4%2Bk3s1/k3s -o /usr/local/bin/k3s \
+RUN curl -fL --retry 3 --retry-delay 10 https://github.com/k3s-io/k3s/releases/download/v1.32.4%2Bk3s1/k3s -o /usr/local/bin/k3s \
  && chmod +x /usr/local/bin/k3s
 
 # ── Stage 2: runtime image ────────────────────────────────────────────────────