better-setup-node v1: pinned musl node + corepack pnpm

README.md

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+# better-setup-node
+
+Fork of the setup-node recipe for git.madapes.com runners. The runner images are musl-based,
+so the official (glibc) Node builds fail with `no such file or directory` on exec — this
+installs the pinned musl build from the official unofficial-builds mirror. When
+`pnpm-version` is set, corepack (bundled with Node) activates that exact pnpm.
+
+```yaml
+- uses: https://git.madapes.com/actions/better-setup-node@v1
+  with: { node-version: "22.14.0", pnpm-version: "10.33.0" }
+```

action.yml

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+name: better-setup-node
+description: Install a pinned musl Node from the official unofficial-builds (glibc builds cannot exec on musl runners) and optionally activate a pinned pnpm via corepack.
+inputs:
+  node-version:
+    description: Exact Node version to install (e.g. 22.14.0).
+    required: true
+  pnpm-version:
+    description: Optional exact pnpm version to activate via corepack.
+    required: false
+    default: ""
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        set -euo pipefail
+        nv="${{ inputs.node-version }}"
+        pv="${{ inputs.pnpm-version }}"
+        need_install=0
+        node --version 2>/dev/null | grep -q "^v${nv%%.*}\." || need_install=1
+        [ "$need_install" = 0 ] && [ -n "$pv" ] && command -v corepack >/dev/null || need_install=1
+        if [ "$need_install" = 1 ]; then
+          case "$(uname -m)" in
+            x86_64|amd64) musl=x64-musl ;;
+            aarch64|arm64) musl=arm64-musl ;;
+            *) echo "better-setup-node: unsupported arch $(uname -m)" >&2; exit 1 ;;
+          esac
+          curl -fsSL "https://unofficial-builds.nodejs.org/download/release/v${nv}/node-v${nv}-linux-${musl}.tar.gz" \
+            | tar -xz -C /usr/local --strip-components=1
+        fi
+        node --version
+        if [ -n "$pv" ]; then
+          corepack enable
+          corepack prepare "pnpm@${pv}" --activate
+          pnpm --version
+        fi