add setup action

tooling/gh-actions/setup/action.yml

@@ -0,0 +1,25 @@
+name: "Setup and install"
+description: "Common setup steps for Actions"
+
+runs:
+  using: composite
+  steps:
+    - uses: pnpm/action-setup@v2
+    - uses: actions/setup-node@v3
+      with:
+        node-version: 18
+        cache: "pnpm"
+
+    - name: Setup bun
+      uses: oven-sh/setup-bun@v1
+      with:
+        bun-version: latest
+
+    - shell: bash
+      run: pnpm install
+
+    - name: Copy .env.example files
+      shell: bash
+      run:
+        find ./examples -type f -name ".env.example" -exec sh -c 'cp "$1"
+        "${1%.example}"' _ {} \;