ci: liberar disco agresivamente en las lanes runtime (el runner moría por disco)

parity-runtime con el data-root en /mnt corrió ~27 min (vs ~5 previos) y
murió en duro: /mnt es el MISMO filesystem que / en estos runners, así que
no daba espacio extra, y la matriz serial acumula ~180 imágenes hasta
llenar el disco (el runner muere y se pierden los logs, de ahí los
BlobNotFound).

Se revierte el data-root a /mnt (inútil) y en su lugar se liberan los SDKs
preinstalados grandes (dotnet/ghc/android/CodeQL/swift/boost/jvm, ~25-30GB;
Go/Node los reinstalan los pasos setup que siguen) + prune de imágenes,
manteniendo el containerd image store. Aplica a parity-runtime y a la lane
arm64 experimental.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: aledbf

.github/workflows/go-cli.yml

@@ -111,21 +111,23 @@ jobs:
       - uses: actions/checkout@v7
         with:
           submodules: recursive
-      # ubuntu-latest ships only ~14GB free on / but a large ephemeral disk on /mnt.
-      # The runtime matrix builds many real images; keeping Docker's data-root on /
-      # exhausts it ("No space left on device"). Move data-root to /mnt and, in the
-      # same daemon config, enable the containerd image store (needed for cache
-      # export / --platform, unsupported by the default docker driver). Also drop
-      # unused preinstalled SDKs to give the root disk headroom (Go/Node are
-      # reinstalled by the setup steps that follow).
-      - name: Configure Docker (data-root on /mnt, containerd store) + free disk
+      # The runtime matrix builds ~180 real images serially; they accumulate and
+      # exhaust the runner's root disk ("No space left on device" — the runner then
+      # dies hard, losing logs). /mnt is the SAME filesystem as / on these runners,
+      # so it buys nothing; instead free the big preinstalled SDKs (Go/Node are
+      # reinstalled by the setup steps that follow) for ~25-30GB of headroom. Also
+      # enable the containerd image store (needed for cache export / --platform).
+      - name: Free disk space + configure Docker (containerd store)
         run: |
-          sudo rm -rf /usr/share/dotnet /opt/ghc /usr/local/lib/android || true
-          sudo mkdir -p /mnt/docker
-          echo '{"features":{"containerd-snapshotter":true},"data-root":"/mnt/docker"}' | sudo tee /etc/docker/daemon.json
+          echo "before:"; df -h / | tail -1
+          sudo rm -rf /usr/share/dotnet /opt/ghc /usr/local/lib/android \
+                      /opt/hostedtoolcache/CodeQL /usr/share/swift \
+                      /usr/local/share/boost /usr/lib/jvm || true
+          sudo docker image prune -af >/dev/null 2>&1 || true
+          echo "after:"; df -h / | tail -1
+          echo '{"features":{"containerd-snapshotter":true}}' | sudo tee /etc/docker/daemon.json
           sudo systemctl restart docker
-          docker info -f 'root={{.DockerRootDir}} driver={{.DriverStatus}}'
-          df -h / /mnt
+          docker info -f 'driver={{.DriverStatus}}'
       - uses: actions/setup-go@v6
         with:
           go-version-file: go.mod
@@ -171,14 +173,13 @@ jobs:
         uses: docker/setup-qemu-action@v3
         with:
           platforms: arm64
-      - name: Configure Docker (data-root on /mnt, containerd store) + free disk
+      - name: Free disk space + configure Docker (containerd store)
         run: |
-          sudo rm -rf /usr/share/dotnet /opt/ghc /usr/local/lib/android || true
-          sudo mkdir -p /mnt/docker
-          echo '{"features":{"containerd-snapshotter":true},"data-root":"/mnt/docker"}' | sudo tee /etc/docker/daemon.json
+          sudo rm -rf /usr/share/dotnet /opt/ghc /usr/local/lib/android \
+                      /opt/hostedtoolcache/CodeQL /usr/share/swift \
+                      /usr/local/share/boost /usr/lib/jvm || true
+          echo '{"features":{"containerd-snapshotter":true}}' | sudo tee /etc/docker/daemon.json
           sudo systemctl restart docker
-          docker info -f 'root={{.DockerRootDir}} driver={{.DriverStatus}}'
-          df -h / /mnt
       - uses: actions/setup-go@v6
         with:
           go-version-file: go.mod