fix: Alpine compatibility + READMEs + roadmap

- setup-node: detect Alpine/Debian, use apk or NodeSource
- setup-aws: use pip on Alpine (musl), binary on Debian (glibc)
- setup-go: fix version parsing for Alpine (no grep -P)
- README per action with usage examples and input docs
- PLAN.md: roadmap for runner images, labels, Lambda dispatch

setup-node/README.md

@@ -0,0 +1,27 @@
+# tinqs/ci/setup-node
+
+Installs Node.js and optionally pnpm.
+
+Detects Alpine vs Debian and uses the right package manager (`apk` or NodeSource). Skips installation if the correct major version is already present in the runner image.
+
+## Usage
+
+```yaml
+- uses: tinqs/ci/setup-node@v1
+```
+
+### Options
+
+```yaml
+- uses: tinqs/ci/setup-node@v1
+  with:
+    node-version: '22'    # default: 22
+    pnpm: 'true'          # default: true
+```
+
+## Inputs
+
+| Input | Default | Description |
+|-------|---------|-------------|
+| `node-version` | `22` | Node.js major version |
+| `pnpm` | `true` | Install pnpm globally |

setup-node/action.yml

@@ -1,11 +1,12 @@
 # tinqs/ci/setup-node — Tinqs Studio CI
-# Installs Node.js via NodeSource and optionally pnpm.
+# Installs Node.js and optionally pnpm.
+# Detects Alpine vs Debian and uses the right package manager.
 # Skips install if the correct major version is already present (pre-baked runner image).
 # Composite action — runs directly on the host.
 # Author: Ozan + Claude Code — 2026-05-22
 
 name: 'Tinqs Setup Node'
-description: 'Install Node.js and pnpm (replaces actions/setup-node)'
+description: 'Install Node.js and pnpm'
 
 inputs:
   node-version:
@@ -24,17 +25,28 @@ runs:
 
         # Skip if already installed at correct major version
         if command -v node &>/dev/null; then
-          CURRENT=$(node --version | grep -oP '\d+' | head -1)
+          CURRENT=$(node --version | sed 's/v//' | cut -d. -f1)
           if [ "$CURRENT" = "$NODE_VERSION" ]; then
             echo "Node $NODE_VERSION already installed"
             node --version
-            [ "$INSTALL_PNPM" = "true" ] && command -v pnpm &>/dev/null && pnpm --version && exit 0
+            if [ "$INSTALL_PNPM" = "true" ] && command -v pnpm &>/dev/null; then
+              pnpm --version
+              exit 0
+            fi
           fi
         fi
 
         echo "Installing Node.js $NODE_VERSION..."
-        curl -fsSL "https://deb.nodesource.com/setup_${NODE_VERSION}.x" | bash -
-        apt-get install -y nodejs
+        if command -v apk &>/dev/null; then
+          # Alpine
+          apk add --no-cache nodejs npm
+        elif command -v apt-get &>/dev/null; then
+          # Debian/Ubuntu
+          curl -fsSL "https://deb.nodesource.com/setup_${NODE_VERSION}.x" | bash -
+          apt-get install -y nodejs
+        else
+          echo "ERROR: unsupported package manager" && exit 1
+        fi
 
         if [ "$INSTALL_PNPM" = "true" ]; then
           npm install -g pnpm